川西北构造样式特征及其油气地质意义  

Characteristics and geological significance of structural patterns in Northwest Sichuan Basin

作　　者：王鼐[1,2] 魏国齐[2] 杨威[2] 王秀姣[2] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油勘探开发研究院廊坊分院

出　　处：《中国石油勘探》2016年第6期26-33,共8页China Petroleum Exploration

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05007)

摘　　要：川西北地区经历多期的构造运动,构造样式多种多样,构造特征复杂多变,对油气勘探有着非常重要的影响。对川西北地区地震资料、测井资料和露头资料进行综合分析与总结,结果表明:其构造样式主要包括基底冲断与滑覆叠加构造、叠瓦扇逆冲断层、断层相关褶皱、反冲断层和背斜构造。以构造样式形成时间可划分出3个构造变形阶段:(1)印支期逆冲推覆阶段;(2)燕山期逆冲推覆阶段;(3)喜马拉雅期逆冲推覆—滑覆阶段。结论认为:各大构造样式当中,断层相关褶皱和高陡背斜可以形成构造圈闭和岩性圈闭,是目前实际的勘探目标;反冲断层组成的构造三角带可以形成构造圈闭和岩性圈闭,是潜在的有利勘探区带。In the Northwest Sichuan Basin, there is a great variety of structural patterns with complicated structural characteristics formed as a result of structural movements during multiple stages, which are significant for petroleum exploration. In this paper, the seismic, logging and outcrop data of the Northwest Sichuan Basin were analyzed comprehensively. The results show that the major structural patterns include superposed basement thrust and sliding-nappe structure, imbricate fan thrust fault, fault-related fold, back-thrust fault and anticline. Considering the time that the structural patterns were formed, three structural deformation stages can be identified, i.e. the thrust-nappe stage during the Indosinian period, the thrust-nappe stage during the Yanshanian period, and the thrust-nappe-sliding-nappe stage during the Himalayan period. Among these structural patterns, the fault-related fold and high ＆ steep anticline may form structural and lithologic traps, and they are targets in current exploration. The structural triangle belt composed by back-thrust faults may also form structural and lithologic traps, serving as potential favorable exploration targets.

关 键 词：川西北 构造样式 龙门山 油气勘探 地质意义 

分 类 号：TE111.2[石油与天然气工程—油气勘探]