Dim Spot Channel Sandstone Identification for Tight Sandstone Gas Reservoir in Western Sichuan

doi:10.11885/j.issn.1674-5086.2022.01.25.01

Abstract

Abstract: The Shaximiao Formation gas reservoir in the eastern slope belt of Western Sichuan Depression is a low-permeability tight channel sandstone gas reservoir. Most channels show "bright spot" reflection characteristics of strong trough amplitude and low impedance on seismic profile. With the development and evaluation of this gas reservoir, it is found that some wells drilled in the channel sand body in the non-target zone also have good hydrocarbon display. However, these channels have the feature of "medium and weak trough amplitude" in the post-stack seismic data, resulting in unclear shape, poor continuity and difficulty in identifying the channels on the plane attribute of seismic amplitude, which is called "dim spot" channel sandstone. Based on the formation mechanism of "dim spot" channel sandstone, the forward modelling analysis is carried out, and it is confirmed that the poor physical property is the key factor for the formation of "dim spot" channel sandstone; then, by analyzing the AVO characteristics of gather, it is clear that the "dim spot" channel has the characteristics of Class I or Class II$_{\rm a}$ AVO characteristics in the prestack gather; finally, the problem of "dim spot" channel sandstone identification is solved by using partial stack technique of dominant incident angle. The feasibility and effectiveness of this method are verified by actual drilling, which strongly promotes the efficient evaluation and production of this gas reservoir.

Key words: tight sandstone gas reservoir, dim spot channel sandstone, AVO characteristics in the prestack gather, partial stack technique of dominant incident angle

CLC Number:

TE122

WANG Jian, DUAN Wenshen, BI Youyi. Dim Spot Channel Sandstone Identification for Tight Sandstone Gas Reservoir in Western Sichuan[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(3): 37-46.

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