Well placing method for karst-type carbonate reservoir

Abstract

The invention discloses a well placing method for a karst-type carbonate reservoir in the technical field of oil and gas exploitation. The well placing method for the karst type carbonate reservoir comprises the steps that S1, firstly, the Ordovician Karst-type reservoir is selected as a well placing object; S2, a plurality of reaction-sensitive parameters of a carbonate rock karst-type reservoir are extracted and screened; S3, the fracture development density generated by multi-stage tectonic movement is predicted through the response variable analysis technology; S4, an ancient geomorphological map of original Ordovician carbonate rock karst is drew; S5, the wave impedance difference of different lithology sections of Ordovician carbonate rock is utilized to determine the reservoir thickness and the spatial distribution form; S6, reasonable evaluation indices are determined, and the karst-type reservoir with consistent reaction through a variety of information is a development zone; and S7, a favorable area with high evaluation indices is selected to conduct well position placing. The serious heterogeneity problem of the reservoir is effectively solved, the reliable basis is provided for well position placing, and the well placing method is reasonable.

Description

Technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a method for arranging wells in a karst carbonate reservoir. Background technique [0002] In oil and gas exploration, carbonate rock is one of the important research goals. However, it is not the carbonate rock as a whole that can form oil reservoirs, but rather irregular shapes, limited spatial scales, and non-uniform distribution among the reservoirs. The caves, fractures, pores and other reservoirs in the rock formation form the so-called heterogeneity of carbonate reservoirs. If the heterogeneous reservoirs cannot be accurately located, the specific location of the oil reservoir cannot be found. Therefore, when arranging wells in carbonate reservoirs, it is very important to detect carbonate reservoirs. Common high- and stable-production carbonate reservoirs are mostly pore-fracture mixed, and do not undergo secondary generation. The modified primary pore carbon...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a well layout method for karst carbonate rock reservoirs, so as to solve the problem that it is difficult to accurately detect the reservoirs using a single technology in the above-mentioned background technology

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