Method of hydrocarbon deposits development

 

(57) Abstract:

The invention relates to oil and gas industry and can be used in the development of deposits and/or gaseous hydrocarbons, is dedicated to fractured reservoirs, to select the location of prospecting, exploration and production wells. Improves the efficiency of the extraction of the hydrocarbons through the optimization of the shallow wells. According to the method of conducting geophysical and borehole research within the field. Based on these results, building seismic sections and paleoreconstructions, determined according to him the geological boundaries of the productive strata. In the Deposit contour establish the location of the faulting zones. On seismic paleoresearch by converting allocate areas of neotectonic movements in the reservoir, put them on a structural map of the field. To highlight areas of neotectonic movements layer sequentially from top to bottom take the geological boundary of the next layer for horizontal. For each subsequent border build the curve of her deviation from this straightened position. Then compare ODA from the maximum amplitudes of the motions for their attenuation. Zones of neotectonic movements establish the presence of deviations of the curves in the greatest number of paleoreconstructions. Productive wells are drilled at selected sites near faults. 1 C.p. f-crystals, 1 Il.

The invention relates to oil and gas industry and can be used in the development of deposits of liquid and/or gaseous hydrocarbons, is dedicated to fractured reservoirs, to select the location of prospecting, exploration and production wells.

Known methods for the development of deposits of hydrocarbons in fractured reservoirs, for example, the method according to the patent of the USSR N 1806261, E 21 B 43/30, 43/00, 1993, including the drilling of wells in the area of deposits and production of hydrocarbons through the production wells located within systems of faults of the reservoir, the location of which in the contour deposits pre-set. According to this method, prior to production drilling on the basis of geophysical studies and other data identified in the reservoir blocks, the boundaries between them and build a map of faults. Due to the high permeability zones of faults increases the flow rate and the target oil production. the act of forming the faulting zones, and if they formed the ancient tectonics and at a later time are not subjected to tectonic movements, the likelihood of clogging of cracks in them is very high, which leads to a significant deterioration of reservoir properties of productive formation.

There is a method of developing oil deposits in tectonically complicated sedimentary strata on the patent of Russian Federation N 2067166, E 21 B 43/20, 1996, including the determination of the existence of blocks of tectonic origin and their boundaries within the structure or field area according to geophysical studies, drilling of production and injection wells and oil production, in which the results of geophysical studies and received at wells survey data to calculate the coefficients of the tectonic deformation of the structure as a whole and its separate sections, determine the magnitude of the relative increment of the thickness of the deformed sections of the structure, determine the magnitude heterodynamic and geoanalytical potentials of the individual sections of the structure, calculate the coefficients inherited deformation across the floor of the basin. On these vistagen values and coefficients ustroitelya unchanged parts of their boundaries and the boundaries of the deformed blocks establish the presence of active tectonic deformation zones. Drilling all categories operate outside of these areas, while producing wells have directly within blocks, and injection wells are placed in the border area units, especially in areas with the greatest change heterodynamic potential.

There is also known a method of developing oil fields in RF patent N 2057921, E 21 B 43/30, 1996, which includes the drilling operation and injection wells, the specification of the path field, the sequence of its development and operation modes of operation and injection wells, which define the stress state of the array, make the selection active tectonic zones in the Deposit area with the subsequent mapping of the stress state, injection wells have relatively more loaded and operating in the unloaded zones. According to these two methods, the location of the most probable hydrocarbon reserves are determined from the stress-strain state of the array, assuming that the content of the fluids in tectonically stressed zones is reduced under the action of compression breeds high voltages with decreasing porous the negative zone. However, in these methods, as noted above, tectonically current conditions are considered to be constant, whereas in reality may be a total or partial clogging of the pore space, "overgrowing" cracks formed the ancient tectonics, which will lead to lower inflows of oil in the well and increase the costs of exploration and exploitation of the Deposit.

The closest in technical essence is a method of forecasting and development of hydrocarbon deposits by allocating neftegazoperspektivnyh layers clinoform strata using the system REEPACK designed for integrated interpretation of seismic and well data, described in the article by A. N. Zolotov, A., Lurie, D. I. the city, FK Salmanov "the Study of productive the Neocomian East Urengoy field", journal "oil and gas Geology", 1998, No. 8, pages 2-11. According to this method, on the basis of geophysical and borehole data obtained along the lines of seismic profiles within the field, build paleoreconstruction seismic sections, which define the geological boundaries of the productive strata, their shape and length, design of seismic data it is divided into convolutional components elementary signal and the shape of the effective reflection coefficients (section IVF), and build local reservoir model, and the magnitude and sign of the effective reflection coefficients that are directly related to lithology and reservoir properties section, judged on the possible presence of hydrocarbon deposits. However, this method is limited in use and cannot be considered as effective as actually using it on paleoresearch only emit layers and interlayers of sandstones, porosity and other reservoir properties which suggest the accumulation of these hydrocarbons, but does not define the zones of development of fractured reservoirs, though, as the experience of drilling operations, oil and gas production depends entirely on the nature and extent of fracturing of the host rocks.

The invention solves the problem of increase of efficiency of development of hydrocarbon deposits by optimizing the shallow wells.

For this purpose, according to the method of development of hydrocarbon deposits, including geophysical and borehole research within the field, based on these results, the building seismic sections, and p is by drilling exploration and production wells, in the Deposit contour establish the location of the faulting zones, seismic paleoresearch by converting allocate areas of neotectonic movements in the reservoir, put them on a structural map of the field, and productive wells are drilled in these designated areas near faults. In this case, to highlight areas of neotectonic movements layer sequentially from top to bottom take the geological boundary of the next layer for horizontal, for each subsequent border build the curve of her deviation from this straightened position, and the obtained curves of the zone of transition from the maximum amplitudes of the motions for their attenuation. The construction of curves of deviation of each subsequent bounds from the straightened position is performed with the original distance between the surface of the casting and the corresponding boundary.

The essence of the method lies in the fact that within the study area field based on the analysis of geological-geophysical information in the field of building seismic paleorrota, establish the areas with the development of disjunctive tectonics and by paleoreconstructions allocate on paleoresearch reductionist collector depends on the presence of fracturing rocks composing it, which is usually associated with the history of the formation of structures at the regional skladkoobrazovaniem and the formation of faults. However, as the calculations show, the conditions of cracking the best in the Central part of the zone of inflection of the reservoir, and the most productive zones are his greatest bending. You can determine the location of fractured zones in the 2nd derivative of the surface's radius of curvature of the reservoir (see Etc. Golf-racht. Fundamentals of petroleum Geology and development of fractured reservoirs. M., Nedra, 1986, pp. 42-46), but this method is not taken into account, does the crack young or ancient tectonics and whether neotectonic movements in the zone of these cracks. In practice, however, field work shows great prospects fractured zones subjected to tectonic movements along the faults in the younger age compared with similar areas of ancient tectonics. Obviously, this effect is due to a lower likelihood of clogging of pore space in neotectonic zones.

To restore the conditions of sedimentation in the proposed method uses the principle of paleoreconstructions temporary seismic sections obtained by the method of obsea diagram shows the transformation of a seismic section, the letters K, M, A, B, C marked reflecting horizons (geological boundary layers), P1 - well, and dash-dotted lines disjunctive violations.

The method is as follows.

Within the developed deposits of conduct different types of studies, including geological, geophysical, geomorphological and others, as well as field studies of the terrain. Based on the data obtained from seismic profiles build temporary seismic sections, perform integrated processing of data by linking the wave field and borehole data, identify the location of productive layers on seismic sections, the shape and length of their borders. Then, with these productive strata establish the presence and location of disjunctive violations and neotectonic movements, characterized by the highest fracture. To do this, carry out the transformation of temporary seismic sections by their paleoreconstructions, taking into account the analysis of the velocity characteristics of the section (interval longitudinal wave velocity VANDand the speed of wave acoustic logging VAKin conjunction with the analysis of structure is remaneat to restore conditions of sedimentation, on the assumption that the alignment of the erosion base or the surface of sedimentation.

The drawing shows the scheme of conversion of a seismic section. First, the upper (K) of traced on seismic section of the geological boundaries of the layer (reflector) level, i.e., lead to horizontal, and the point of bringing it is the beginning of a section of seismic profile). From the leveled surface spend building all the underlying geological boundaries, for example, MKCKBKand AK, keeping a distance t between the surface of the casting and the corresponding boundary, thereby restoring the conditions of sedimentation on time, superposed on the corresponding aligned with the boundary of K. Then similarly align the boundary of M and is built on the attitude underlying reflecting boundary CMBM, AM. A similar procedure is performed for each regular (top to bottom) surface of the alignment will be held until the construction of the initial condition of the Foundation at the time of the formation of sedimentary strata between the Foundation and the first bottom of the reflecting horizon. The result of such transformations seismic section bodega reflecting horizon.

Each of paleoreconstructions from an earlier geophysical and other studies establish the location of disjunctive violations, as well as areas of greatest fracture (in the drawing, they are denoted Z), as areas of transition from the maximum amplitudes of motions for areas of decay. These plots can be viewed as a "hinge zone", in which the layers during tectonic movements undergo the greatest deformation.

Then the paleoreconstructions compare, for example, by overlaying the curves of each subsequent paleoreconstructions on previous curves (in the drawing superimposed curves shown by dashed lines) and determine the sections of the reservoir, which "lived", that is experienced constant tectonic shifts during different time of sedimentation. Those areas that are tracked on the largest number of seams, especially on the upper (younger age), and are located near the faulting zones, and is considered the most promising for the building of productive wells.

After that, the structural maps perspective on the content of hydrocarbon reservoirs cause places of faults and the physical data select the location of productive wells within these areas near faults.

Thus, the claimed method allows you to rajonirovanie the field area by age disjunctive tectonics and its quantitative parameters, i.e. to determine the age of the shallow zones disjunctive dislocation, their activation and attenuation, amplitude, and rate of sedimentation. Thus, the method makes it possible to improve the efficiency of the development of hydrocarbon deposits due to the optimum shallow wells for various purposes and reduce the cost of their drilling.

1. The way of the development of hydrocarbon deposits, including geophysical and borehole research within the field, based on the data construction of a seismic sections and their paleoreconstruction, determination thereon geological boundaries of the productive strata and the Deposit is mined by drilling exploration and production wells, characterized in that the contour of the deposits set the location of the faulting zones, allocate zones of neotectonic movements in the reservoir by converting paleoreconstructions seismic sections, which consistently take down the geological boundary of the next layer for horizontal, for kathleengentry by overlaying the curves of the respective layers, the obtained curves of the plots of the transition from the maximum amplitudes of the motions for their decay, and the presence of deviations of the curves in the greatest number of paleoreconstructions establish zones of neotectonic movements, then put the selected zone on the structural map of the field, and productive wells are drilled in these selected areas near faults.

2. The method according to p. 1, characterized in that the construction of curves of deviation of each subsequent bounds from the straightened position is performed with the original distance between the surface of the casting and the corresponding boundary.

 

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