四川盆地震旦系、寒武系烃源岩特征、资源潜力与勘探方向

发布时间：2018-01-21 17:49

本文关键词： 烃源岩资源潜力震旦系寒武系四川盆地　出处：《天然气地球科学》2017年01期 　论文类型：期刊论文

【摘要】：2013年四川盆地川中地区震旦系—寒武系发现了安岳特大型气田,储量规模达万亿立方米,在全球古老地层天然气勘探中尚属首次。气源研究认为,震旦系天然气来源于震旦系和寒武系烃源岩,开展震旦系及寒武系古老烃源岩系统研究,对全球古老地层油气地质领域具有重要的科学和实践意义。通过对四川盆地震旦系、寒武系钻井资料和野外剖面观察,利用28 000km地震资料解释结果和新钻井资料,结合2 315样次烃源岩地球化学分析,系统研究了下寒武统优质烃源岩中心,主要沿绵竹—长宁克拉通内裂陷分布,累计厚度可达200~450m,其他地区烃源岩厚度为50~100m,裂陷范围内烃源岩对震旦系—寒武系天然气资源贡献约占全盆地的56%~63%;系统评价了震旦系灯影组灯三段泥质烃源岩及其分布,TOC含量介于0.04%~4.73%之间,平均为0.65%,川中地区厚度在10~30m之间;首次系统研究了能够形成大气田的中国最古老震旦系烃源岩,大川中地区震旦系烃源岩总生气强度为(15~28)×10~8 m~3/km~2,具备形成大气田的气源条件。采用成因法、类比法重新评价全盆地震旦系、寒武系天然气资源量为(4.65~5.58)×10~(12) m~3,天然气资源潜力巨大。川中区块天然气资源量约占全盆地总资源量的66%,是当前勘探的首选。
[Abstract]:In 2013, the Anyue super large gas field was discovered in the Sinian and Cambrian in Sichuan Basin, with a reserve scale of 100 billion cubic meters, which is the first time in the exploration of natural gas in the ancient strata of the world. Sinian natural gas is derived from Sinian and Cambrian source rocks, and the ancient source rock systems of Sinian and Cambrian have been studied. It is of great scientific and practical significance in the field of oil and gas geology of ancient strata in the world. The drilling data and field profile of Sinian and Cambrian systems in Sichuan Basin are observed. Based on the interpretation results of 28000km seismic data and the new drilling data, combined with the geochemical analysis of 2 315 secondary hydrocarbon source rocks, the center of high quality hydrocarbon source rocks in the Lower Cambrian is systematically studied. It mainly distributes along Mianzhu-Changning craton rift, the accumulative thickness can reach 200 ~ 450m, and the thickness of source rock in other areas is 50 ~ 100m. The contribution of source rocks to the natural gas resources of Sinian to Cambrian is about 56% of the whole basin. The content of TOC in the muddy source rocks and their distribution in the third member of the Dengying formation of the Sinian Dengying formation is between 0.04% and 4.73%, with an average of 0.65%, and the thickness of the central Sichuan area is 100.30 m. For the first time, the source rocks of the oldest Sinian system in China, which can form large gas fields, have been systematically studied. The total gas generation intensity of the source rocks of the Sinian system in the central part of Dachuan is Y151.28) 脳 10 ~ (8) m ~ (-1) / (3 / km ~ (-1) ~ (2)). The gas source conditions for forming a large gas field are obtained. Genetic method and analogy method are used to re-evaluate the Sinian system in the whole basin. The Cambrian natural gas resource is 4.65 ~ 5.58 脳 10 ~ 10 ~ (12) m ~ (-1) 路m ~ (3). The natural gas resources in the central Sichuan block account for 66% of the total resources in the basin, which is the first choice for exploration at present.
【作者单位】：中国石油勘探开发研究院廊坊分院;中国石油天然气集团公司天然气成藏与开发重点实验室;
【基金】：国家科技重大专项(编号:2016ZX05007) 中国石油天然气股份公司重点科技项目(编号:2016B-0600)联合资助
【分类号】：P618.13
【正文快照】： 0引言自发现威远气田以来,诸多学者对四川盆地震旦系、寒武系烃源岩开展了大量研究,认为下寒武统筇竹寺组是震旦系气藏的主要烃源岩层[1-6]。对于震旦系烃源岩的研究认为,灯影组富藻白云岩具有一定生烃能力,但总体生烃能力弱,不具备形成大气田的条件[1-3]。近2年的勘探在川

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