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大巴山前缘下寒武统黑色页岩气勘探前景分析

发表时间:2014-11-15  浏览量:1413  下载量:543
全部作者: 冉波,叶玥豪,孙玮,王世玉
作者单位: 成都理工大学油气藏地质及开发工程国家重点实验室;陕西延长石油(集团)有限责任公司研究院
摘 要: 以大巴山地区为研究工区,通过对大巴山地区下古生界水井沱组的沉积相、总有机碳(total organic carbon, TOC)、成熟度(Ro)、埋深、构造等的研究表明,大巴山前缘:1) 水井坨组沉积环境为深水陆棚-大陆斜坡-深海盆地相;2) 水井坨组的厚度为200~300 m,黑色页岩的厚度为30~195 m,TOC>2%的厚度可达60~90 m,TOC>1%的厚度达120~180 m;3) 有机质类型较好,主要为Ⅰ型-Ⅱ1型干酪根,TOC含量较高,为1.6%~3.0%,平均2%左右;Ro为1%~4%,平均在3%左右;4) 埋深主要在2 500~3 000 m范围内。因此,各种参数对页岩气的富集和开发是有利的。但由于大巴山地区构造作用强烈,并且下寒武统为一个区域滑脱层,这可能对页岩气的富集起到破坏作用。
关 键 词: 地质学;页岩气;黑色页岩;下寒武统
Title: Shale gas accumulation conditions and exploitation prospect of Lower Cambrian black shale in Dabashan area
Author: RAN Bo, YE Yuehao, SUN Wei, WANG Shiyu
Organization: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology; Research Institute of Yanchang Petroleum (Group) Co. Ltd.
Abstract: Taking Dabashan area as the study object, through the research on the deposition, total organic carbon (TOC), Ro, burial depth and structure of Shuijingtuo formation, the results showed that: 1) the depositional environment was the deep water shelf-slope-the submarine basin; 2) sedimentary thickness was 200-300 m, thickness of black shale was 30-195 m, the thickness of the black shales with TOC>2% was 60-90 m and with TOC>1% was 120-180 m; 3) type of organic matter was type Ⅰ-Ⅱ1 type kerogen, the TOC was from 1.6% to 3.0% (averaging of 2%), Ro was from 1% to 4% (averaging of 3%); 4) the burial depth was 2 500-3 000 m. These various parameters showed that the Shuijingtuo formation was favorable for the enrichment and development of shale gas. However, due to strong tectonics of Dabasn structure and regional detachment of Lower Cambrian, it was not favorable for shale gas enriching.
Key words: geology; shale gas; black shale; Lower Cambrian
发表期数: 2014年11月第21期
引用格式: 冉波,叶玥豪,孙玮,等. 大巴山前缘下寒武统黑色页岩气勘探前景分析[J]. 中国科技论文在线精品论文,2014,7(21):2122-2129.
 
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