Method for determining deposition characteristics and distribution of reservoirs by combining logging and seismic information

Abstract

The invention is a method for determining deposition characteristics and distribution of reservoirs by combining logging and seismic information. The method comprises the following steps: on the basis of single-well middle-term and middle-short-term deposition cycle division, inter-well fitting is carried out on a deposition cycle interface, correction is carried out with the use of a seismic structural surface, and the trend surfaces of top-bottom interfaces of corresponding grid cells are obtained; and logging attribute parameters in grid cells in the vertical direction are roughly calculated to obtain a unique logging data thinning value, the minimum well spacing of a work area is selected as the step length of the lateral extrapolation distance, and inter-well interpolation and fitting are carried out to obtain a three-dimensional hierarchical coarsening logging data volume reflecting well logging facies or deposition characteristics of reservoirs. According to the method of the invention, single-well reservoir vertical grid dissection in three-dimensional reservoir geological modeling and multi-phase inferior time deposition cycle structure and frame in geo-science, an inside-grid logging attribute sampling point coarsening technology and a geological method, and the single-well-point vertical grid thinning logging attribute value and a multi-well spatial interpolation algorithm are closely combined so as to obtain a three-dimensional hierarchical coarsening analysis data volume capable of reflecting well logging facies or deposition characteristics and change of reservoirs, thus realizing matching and comparative interpretation on the basis of closely combining logging and seismic data.

Description

technical field [0001] The invention belongs to a method for jointly determining reservoir deposition characteristics and distribution with well seismic information in oil and gas exploration technology. technical background [0002] In the exploration and development stage of oil and gas fields, with the increase of well pattern density, the role of well logging data in reservoir deposition characteristics and plane distribution, oil and gas reservoir analysis, reservoir and reservoir static geological modeling is becoming more and more important. At present, the common problems and status quo in the interpretation method, process and comprehensive application of well seismic information of logging data (data) are as follows: [0003] ① Too much emphasis is placed on the subdivision of micro-sedimentary units of vertical reservoirs in a single well or the fine extraction and analysis of small-scale logging information. Due to the lack of continuous, periodic, hierarchical, ...

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Problems solved by technology

[0003] ① Too much emphasis is placed on the subdivision of micro-sedimentary units of vertical reservoirs in a single well or the fine extraction and analysis of small-scale logging information. Due to the lack of continuous, periodic, hierarchical, large-scale, superimposed The hierarchical control and natural constraints of equal-time sedimentary deep windows artificially increase the uncertainty, multi-solution and difficulty in the comparison and interpretation of small units (such as sedimentary microfacies) between wells;

[0004] ②Insufficient attention has been paid to the statistical effects of continuous logging data variable sets and the macro-sedimentary characteristics of the mapped reservoirs, especially the single-well sequence level, parasequence (group) level or mid-stage, Formed by medium-short-term sedimentary cycles, the top and bottom interfaces of relatively equal-time sedimentary bodies, and the size of stratigraphic units are used to reasonably and hierarchically divide the analysis windows of logging data combinations, and the single-well vertical advantage of information

[0005] ③ There is no method to directly realize the continuous tracking analysis and volume interpretation of the macro-sedimentary characteristics of reservoirs in multi-well space without the help of vertical coarsening (statistics) technology of single well sensitive attributes and reasonable interpolation method among multiple wells in geological modeling

[0006] ④ Although the current seismic resolution ability is still limited, it is usually able to resolve large-scale sedimentary units (sedimentary facies, subfacies) such as stratigraphic sequences and parasequences (groups), especially those with definite spatial upper-shaped structures. (strata, sedimentary facies boundaries, and fault planes) have distribution trend advantages; however, there is no matching seismic interpretation on the same scale for seismic interpretation (seismic profile attributes and seismic sedimentary facies slice analysis, etc.) Reasonable calibration, calibration and comparison constraints for well phases

[0007] Therefore, at present, a high degree of integration of well logging and seismic data has not been really realized, and the vertical constraint force of well points and the three-dimensional advantages of seismic data have not been fully utilized. There is no method to improve the logging information to quickly determine the characteristics and distribution of reservoir sedimentation

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