Method for subtly depicting broken edges of thick-layer fault block oil reservoir

Abstract

The invention provides a method for subtly depicting broken edges of a thick-layer fault block oil reservoir. The method comprises the steps that subtle stratigraphic correlation is conducted, and the position of a breakpoint encountered during well point drilling is reasonably determined; through fault structure subtle interpretation, the fault form and a plane combination rule are identified and described; well inclination data are corrected so as to ensure the accuracy of the breakpoint encountered during well point drilling and stratified data underground locations; and a three-dimensional geological model serves as the support and platform, fault data of the breakpoint and seismic interpretation of geological research comparison are integrated in the three-dimensional geological model, through well-seismic mutual calibration, well data points are inlayed in a seismic interpretation face, and with the well-seismic-model combination, the broken edge form is subtly depicted. According to the method for subtly depicting the broken edges, on the basis of subtle broken edge depiction, the potential of remaining oil nearby a fault in the later stage of exploitation is successfully dug by using fault-near horizontal well, new exploitation of a thick-layer-near abandoned layer is achieved, and a feasible method is provided for digging the potential of the remaining oil nearby the fault in the later stage of exploitation.

Description

technical field [0001] The invention relates to the field of research on faults in fault block oil reservoirs, in particular to a method for finely depicting fault ridges in fault block oil reservoirs. Background technique [0002] Thick fault-block reservoirs have the geological characteristics of large single-layer thickness, large reserves, and high abundance of reserves. The well pattern usually used in the development of this type of reservoir is the top-dense side-thin, low-injection and high-production method. After years of development At present, most units have entered the stage of ultra-high water cut, and the degree of recovery is high. Generally, vertical wells with high water cut have been shut down for many years, and the reservoir is in a near-abandoned state. Under the joint action of fault shielding, bottom water coning and edge water tongue intrusion, the remaining oil is relatively enriched in the structural high part of the fault line, but most of them a...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for finely depicting fault ridges in thick fault block reservoirs, to solve the problem of effectively tapping the remaining oil near faults in thick fault block reservoirs in the later stage of development, and to realize a new approach to near-abandoned thick fault block reservoirs. purpose of development

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