Volcano rock reservoir fluid identification method

Abstract

The invention provides a technical method of volcano rock reservoir fluid identification and belongs to the field of oil and gas field exploration and development. The method comprises the steps that (1) core and imaging data are used to calibrate the response characteristics of a dual laterolog crack; (2) according to the dual laterolog crack response mode established in the step (1), a crack upgrowth section is found; (3) a production test result is used to find the gas reservoir and the non gas reservoir; (4) by respectively analyzing the gas reservoir and the non gas reservoir, the dual laterolog logging response characteristics of the crack type gas reservoir and the crack type non gas reservoir are acquired; (5) the dual laterolog logging response characteristics of the crack type gas reservoir and the crack type non gas reservoir are compared, and the difference characteristics are analyzed to establish the discrimination basis of a gas bearing crack type reservoir and a gas free crack type reservoir; (6) according to the step (5), the dual laterolog identification mode of crack and fluid difference study is established; and (7) a dual laterolog principle is used to carry out fluid identification on a non crack type reservoir, so as to realize the fluid identification of all reservoirs.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and relates to a logging technology for identifying reservoir fluids, in particular to a method for identifying fluids in volcanic rock reservoirs. Background technique [0002] Two logging curves are obtained through dual lateral resistivity logging: deep lateral resistivity curve and shallow lateral resistivity curve. The deep lateral resistivity curve has a deep detection depth, which can better reflect the true resistivity in the deep formation, that is, the original formation resistivity; while the shallow lateral resistivity mainly detects the resistivity change of the rock formation near the borehole wall. The well section reflects the resistivity of the invasion zone, that is, the mud filtrate resistivity. Due to the difference in the detection depth and position of the deep and shallow lateral, whether the formation contains fluid or fractures can cause the differenc...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that it is difficult to distinguish the differences in the response of the dual lateral resistivity to the characteristics of fluid and fractures in China, which makes it difficult to use the difference of the dual lateral resistivity curves to directly and accurately conduct To solve the problem of fluid identification, provide a method for identifying fluid in volcanic rock reservoirs, use core and imaging data to scale the fracture response characteristics of dual lateral resistivity; combine production test results to find out fractured gas layers and fractured non-gas layers, respectively Summarize the dual lateral response characteristics of the two; compare the difference between the dual lateral response of the fractured gas layer and the fractured non-gas layer, that is, find the dual lateral response characteristics of the gas layer; finally establish the basis for the study of the difference between fractures and fluids Dual lateral identification mode, so as to realize the effective identification of gas layers in complex volcanic rock reservoirs

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