川东北开江地区茅口组凹陷异常体分布特征及成因

doi:10.7657/XJPG20200505

摘要/Abstract

摘要：

基于三维地震资料以及高精度曲率地震属性,对川东北开江地区地震剖面上茅口组凹陷异常体分布特征及成因进行分析。研究发现,凹陷异常体在开江地区广泛分布,且主要位于峨眉地裂时期形成的北西西—南东东向走滑断裂附近;走滑断裂为热液运移提供良好的渗流通道,可对茅口组灰岩进行改造,形成良好储集体。通过地震、地质联合分析,认为热液溶蚀是茅口组凹陷异常体形成的主要原因。明确热液溶蚀凹陷异常体的分布特征和成因,对扩大川东北地区油气勘探、增储上产具有一定的指导意义。

关键词: 川东北地区, 茅口组, 凹陷异常体, 分布特征, 成因分析, 走滑断裂, 热液溶蚀

Abstract:

Based on 3D seismic data and high-precision seismic curvature, the distribution and genesis of the abnormal bodies on seismic sections are analyzed in the Maokouzu sag in the Kaijiang area, northeastern Sichuan basin. It is found that the abnormal bodies are widely distributed in the Kaijiang area and mainly located near the NWW-SEE strike-slip faults developed during the Emei taphrogenesis. The strike-slip faults provide good channels for the migration of hydrothermal fluid which erodes the limestone of the Maokou formation, and consequently creates good reservoirs. Joint analysis of seismic and geological data found that it was hydrothermal dissolution that caused the formation of abnormal bodies in the Maokouzu sag. It is of great significance to make clear the distribution and genesis of the abnormal bodies in expanding the exploration field and increasing the reserves and production in the northeastern Sichuan basin.

Key words: northeastern Sichuan basin, Maokou formation, abnormal body, distribution, genesis, strike-slip fault, hydrothermal dissolution

中图分类号:

TE112.21

杨柳, 臧殿光, 徐宝亮, 邓绍强, 陈虹帆, 杨荣荣, 陈伟. 川东北开江地区茅口组凹陷异常体分布特征及成因[J]. 新疆石油地质, 2020, 41(5): 542-549.

YANG Liu, ZANG Dianguang, XU Baoliang, DENG Shaoqiang, CHEN Hongfan, YANG Rongrong, CHEN Wei. Distribution and Genesis of Abnormal Bodies in Maokouzu Sag in Kaijiang Area, Northeastern Sichuan Basin[J]. Xinjiang Petroleum Geology, 2020, 41(5): 542-549.

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