石油勘探与开发 >

2019 , Vol. 46 >Issue 2: 397 - 408

DOI: https://doi.org/10.11698/PED.2019.02.21

综合研究

川西北地区构造地质结构与深层勘探层系分区

  • 陈竹新 ,
  • 李伟 ,
  • 王丽宁 ,
  • 雷永良 ,
  • 杨光 ,
  • 张本健 ,
  • 尹宏 ,
  • 苑保国
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  • 1.中国石油勘探开发研究院,北京 100083;
    2.中国石油盆地构造与油气成藏重点实验室,北京 100083;
    3.中国石油西南油气田公司勘探开发研究院,成都 610041;
    4.中国石油西南油气田公司川西北气矿,四川江油 621700
陈竹新（1979-）,男,江西永修人,博士,中国石油勘探开发研究院高级工程师,从事盆地构造解析与建模方面的研究。地址：北京市海淀区学院路20号,中国石油勘探开发研究院石油实验地质研究中心,邮政编码：100083。E-mail：chenzhuxin@petrochina.com.cn

收稿日期: 2018-09-29

  网络出版日期: 2019-01-24

基金资助

国家油气科技重大专项（2016ZX05003-001）; 中国石油天然气股份有限公司科技重大专项（2016E-0601,2016B-0501）

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Structural geology and favorable exploration prospect belts in northwestern Sichuan Basin, SW China

  • CHEN Zhuxin ,
  • LI Wei ,
  • WANG Lining ,
  • LEI Yongliang ,
  • YANG Guang ,
  • ZHANG Benjian ,
  • YIN Hong ,
  • YUAN Baoguo
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  • 1.Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
    2.Key Laboratory of Basin Structure & Hydrocarbon Accumulation, CNPC, Beijing 100083, China;
    3.Research Institute of Petroleum Exploration & Development, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China;
    4.Northwest of Sichuan Gas Production District, PetroChina Southwest Oil & Gasfield Company, Jiangyou 621700, China;

Received date: 2018-09-29

  Online published: 2019-01-24

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摘要

川西北地区经历了震旦纪至中三叠世的海相盆地和中—新生代陆相盆地构造演化过程,期间遭受多个阶段性区域构造活动影响,深层发育复杂的地层分布及构造变形,在关键构造期形成了包括震旦系灯影组阶梯状台地、志留纪末西部古隆起、晚古生代—中三叠世被动陆缘等特征性的构造和沉积结构。晚三叠世以来的中—新生代多期不同方向的陆内挤压构造作用则形成了盆地周缘及内部的复杂冲断褶皱构造。龙门山北段冲断带前缘发育深层原地冲断构造,表现为受下三叠统和下寒武统中的两套滑脱层控制而成的多层次变形结构,包括浅层褶皱构造、中层薄皮冲断构造和深层基底卷入构造。米仓山冲断带前缘主要表现为受下三叠统盐滑脱层分隔的双层变形结构,包括浅层单斜构造和深层叠瓦逆冲构造。盆地内部则主要表现为晚期形成的多排北东东向基底卷入褶皱变形。川西北地区深层有利勘探层系和区带具有明显的分区特征,震旦系灯影组有利勘探层系主要分布于川西北东部和北部地区,以九龙山构造带、梓潼向斜带、盐亭斜坡带最为有利;下古生界受加里东古隆起和晚期褶皱改造,盆地中西部深层最为有利,以梓潼向斜带为典型;上古生界有利区则主要分布于龙门山北段及其前缘地区,中构造层隐伏薄皮冲断构造带是重点勘探领域。图10表1参33

关键词： 四川盆地; 川西北地区; 冲断带; 多滑脱; 震旦系; 古生界; 台缘带; 古隆起; 构造变形; 构造演化; 油气勘探

本文引用格式

陈竹新 , 李伟 , 王丽宁 , 雷永良 , 杨光 , 张本健 , 尹宏 , 苑保国 . 川西北地区构造地质结构与深层勘探层系分区[J]. 石油勘探与开发, 2019 , 46(2) : 397 -408 . DOI: 10.11698/PED.2019.02.21

Abstract

The northwestern Sichuan region has experienced multi-stage tectonic evolution including marine cratonic basin from the Sinian to the Middle Triassic and intra-continental basin from the Late Triassic to the Cenozoic. Several regional tectonic activities caused complicated stratigraphic distribution and structural deformations in the deep-buried layers. During the key tectonic periods, some characteristic sedimentary and deformation structures were formed, including the platform margin of Dengying Formation, the western paleo- high at the end of Silurian, and the passive continental margin of the Late Paleozoic-Middle Triassic. The Meso-Cenozoic intra-continental compressional tectonic processes since the Late Triassic controlled the formation of complex thrusting structures surrounding and inside the northwestern basin. The northern Longmenshan fold-thrust belt has a footwall in-situ thrust structure, which is controlled by two sets of detachments in the lower Triassic and lower Cambrian and presents as a multi-level deformation structure with the shallow folds, the middle thin-skin thrusts and the deeper basement-involved folds. The thrust belt in front of the Micangshan Mountain shows a double-layer deformation controlled by the lower Triassic salt detachment, which is composed by the upper monocline and deep-buried imbricate thrust structures. The interior of the basin is characterized by several rows of large-scale basement-involved folds with NEE strike direction. From the perspective of structural geology, the favorable exploration reservoirs and belts in northwestern Sichuan have obvious zoning characteristics. The favorable exploration layers of Dengying Formation of Upper Sinian are mainly distributed in the eastern and northern areas of the northwestern Sichuan Basin, in which the Jiulongshan structural belt, Zitong syncline and Yanting slope are the most favorable. The Lower Paleozoic was transformed by Caledonian paleo-uplift and late Cenozoic folding, and the midwest area such as the Zitong syncline is a potential area for hydrocarbon exploration. The favorable part of the Upper Paleozoic is mainly distributed in the northern Longmenshan belt and its frontal area, where the deep-buried thin-skin thrust structures in the footwall are the key exploration targets.

Key words： northwestern Sichuan Basin; fold-thrust belt; multi-level detachment; Sinian; Paleozoic; platform margin; paleohigh; structural deformation; tectonic evolution; hydrocarbon exploration

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