Method for analyzing sand bodies in reservoirs based on inversion technique of sedimentary dynamics

Abstract

The invention discloses a method for analyzing sand bodies in reservoirs based on an inversion technique of the sedimentary dynamics under the condition of sparse wells. The method is characterized in that through building a sand-body inversion model of sedimentary dynamics based on a principle of three-dimensional sedimentary transport geology and considering the control action of fluid velocity on sedimentary evolution and the reconstructive function of tectonic movements, the analysis on the distribution evolution of sand bodies in complex sedimentary basins under the condition of sparse wells can be realized. The method is implemented through the following steps: re-simulating the relationship between the three-dimensional attribute distribution data of a single sand layer of a reservoir and the time variation; carrying out variance making on the pre-simulated results and the results obtained by simulating well-point data as well as well logging interpretation and bore-hole data of the reservoir; according to the concept of a negative gradient search algorithm, modifying the terrain, flow field and source distribution of the reservoir; and operating the steps until the accuracy conditions of reservoir modeling are satisfied. The method disclosed by the invention provides a basis for the development of analysis on sand bodies in basin reservoirs under the condition of sparse wells, and is especially suitable for being applied to the research on sand bodies in sea basins with less drill holes.

Description

Technical field: [0001] The invention relates to reservoir sand analysis technology. Background technique: [0002] With the reduction of exploitable oil and gas resources in onshore basin reservoirs, offshore basins have become the focus of oil and gas exploration and development in the next step. Due to the difficult conditions for exploration and drilling in offshore basins, drilling and logging data in offshore basins are relatively scarce. If the analysis of reservoir sand bodies under the condition of fewer wells is carried out, the research on reservoirs in marine basins is becoming more and more important. Generally, the sequence stratigraphic kinematics forward modeling model can be used for reservoir sand body analysis. A common feature of these models is the simulation of the effects of tectonic subsidence, sediment supply, erosion, sea level and temperature changes on the spatial distribution of deposition. In particular, the geometric simulation system of two...

AI Technical Summary

Problems solved by technology

This method focuses on the analysis of the profile sequence, and the prediction of the planar distribution of sand bodies is too rough, and it is not suitable for alluvial fans responsible for sedimentary systems where it is difficult to establish a sedimentary state function set.

[0003] Establishing a sandbody inversion model of sedimentary dynamics based on three-dimensional sedimentary transport geological principles, and considering the control of fluid velocity on sedimentary evolution and the transformation of tectonic movement, is the key to realize the analysis of sandbody distribution and evolution in complex sedimentary basins under the condition of few wells. Ideal way, but there are a series of complex problems to be solved in the implementation method and simulation technology, so it is currently in the exploratory stage

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