石油勘探与开发 >

2019 , Vol. 46 >Issue 1: 39 - 51

DOI: https://doi.org/10.11698/PED.2019.01.04

油气勘探

中—上扬子地区震旦纪陡山沱组沉积期岩相古地理及勘探意义

  • 汪泽成 ,
  • 刘静江 ,
  • 姜华 ,
  • 黄士鹏 ,
  • 王坤 ,
  • 徐政语 ,
  • 江青春 ,
  • 石书缘 ,
  • 任梦怡 ,
  • 王天宇
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  • 1. 中国石油勘探开发研究院,北京 100083;
    2. 中国石油杭州地质研究院,杭州 310013
汪泽成（1966-）,男,安徽太湖人,博士,中国石油勘探开发研究院教授级高级工程师,主要从事含油气盆地构造、油气地质综合研究工作。地址：北京市海淀区学院路20号,中国石油勘探开发研究院专家室,邮政编码：100083。E-mail：wangzecheng@petrochina.com.cn

收稿日期: 2018-05-14

  修回日期: 2018-10-25

  网络出版日期: 2018-12-17

基金资助

国家科技重大专项“下古生界—前寒武系碳酸盐岩油气成藏规律、关键技术及目标评价”（2016ZX05004-001）; 国家重点研发计划“中新元古界微生物碳酸盐岩沉积环境与成储机制”（2017YFC0603103）

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Lithofacies paleogeography and exploration significance of Sinian Doushantuo depositional stage in the middle-upper Yangtze region, Sichuan Basin, SW China

  • WANG Zecheng ,
  • LIU Jingjiang ,
  • JIANG Hua ,
  • HUANG Shipeng ,
  • WANG Kun ,
  • XU Zhengyu ,
  • JIANG Qingchun ,
  • SHI Shuyuan ,
  • REN Mengyi ,
  • WANG Tianyu
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  • 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083;
    2. PetroChina Hangzhou Research Institute of Petroleum, Hangzhou 310023, China

Received date: 2018-05-14

  Revised date: 2018-10-25

  Online published: 2018-12-17

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摘要

近年来四川盆地及邻区震旦系灯影组天然气及陡山沱组页岩气勘探均取得重大突破,但对陡山沱组的沉积背景条件缺乏系统研究。利用大量露头资料,结合少量钻井、地震资料,分析了中—上扬子地区陡山沱组沉积期岩相古地理格局、沉积环境、沉积演化及烃源岩分布。研究表明：①中—上扬子地区陡山沱组沉积期沉积充填序列及地层分布受古隆起和边缘凹陷控制。古隆起区陡山沱组超覆沉积,厚度薄,发育滨岸相、混积陆棚相、非典型碳酸盐台地相;边缘凹陷地层齐全、厚度大,发育深水陆棚相和局限海盆相。②陡山沱组沉积序列总体表现为“海侵-高位-海退”的一个完整沉积旋回。陡山沱组一段为海侵初期的非典型碳酸盐缓坡沉积,陡山沱组二段为广泛海侵期的滨岸—混积陆棚沉积,陡山沱组三段为海侵高位阶段的非典型局限—开阔海台地沉积。③陡山沱组二段发育富有机质黑色页岩,分布稳定、厚度大,是重要的烃源岩发育层段和页岩气主力层段;陡山沱组三段以微生物碳酸盐岩为特征,有较好的储集条件,有利于天然气及磷等矿产资源成藏（矿）富集,为值得重视的新领域。秦岭海槽、鄂西海槽是天然气（包括页岩气）及磷矿、锰矿等矿产资源勘查的有利区。图10表2参29

关键词： 震旦系; 陡山沱组; 岩相古地理; 四川盆地; 古隆起; 边缘凹陷; 碳酸盐台地; 黑色页岩; 烃源岩

本文引用格式

汪泽成 , 刘静江 , 姜华 , 黄士鹏 , 王坤 , 徐政语 , 江青春 , 石书缘 , 任梦怡 , 王天宇 . 中—上扬子地区震旦纪陡山沱组沉积期岩相古地理及勘探意义[J]. 石油勘探与开发, 2019 , 46(1) : 39 -51 . DOI: 10.11698/PED.2019.01.04

Abstract

In recent years, natural gas exploration in the Sinian Dengying Formation and shale gas exploration in Doushantuo Formation have made major breakthroughs in the Sichuan Basin and its adjacent areas. However, the sedimentary background of the Doushantuo Formation hasn’t been studied systematically. The sedimentary paleogeographic pattern, sedimentary environment, sedimentary evolution and distribution of source rocks during the depositional stage of Doushantuo Formation were systematically analyzed by using a large amount of outcrop data, and a small amount of drilling and seismic data. (1) The sedimentary sequence and stratigraphic distribution of the Sinian Doushantuo Formation in the middle-upper Yangtze region were controlled by paleo-uplifts and marginal sags. The Doushantuo Formation in the paleouplift region was overlayed with thin thickness, including shore facies, mixed continental shelf facies and atypical carbonate platform facies. The marginal sag had complete strata and large thickness, and developed deep water shelf facies and restricted basin facies. (2) The Doushantuo Formation is divided into four members from bottom to top, and the sedimentary sequence is a complete sedimentary cycle of transgression-high position-regression. The first member is atypical carbonate gentle slope deposit in the early stage of the transgression, the second member is shore-mixed shelf deposit in the extensive transgression period, and the third member is atypical restricted-open sea platform deposit of the high position of the transgression. (3) The second member has organic-rich black shale developed with stable distribution and large thickness, which is an important source rock interval and major shale gas interval. The third member is characterized by microbial carbonate rock and has good storage conditions which is conducive to the accumulation of natural gas, phosphate and other mineral resources, so it is a new area worthy of attention. The Qinling trough and western Hubei trough are favorable areas for exploration of natural gas (including shale gas) and mineral resources such as phosphate and manganese ore.

Key words： Sinian; Doushantuo Formation; lithofacies paleogeography; Sichuan Basin; paleo-uplift; marginal sag; carbonate platform; black shale; source rock

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