四川盆地蓬探1井灯影组灯二段油气勘探重大发现及意义

doi:10.3969/j.issn.1672-7703.2020.03.001

摘要/Abstract

摘要： 蓬探1井是部署在四川盆地德阳—安岳裂陷内以震旦系灯影组为主要目的层的风险探井，探索裂陷主力烃源灶区灯影组储层及含气性。利用蓬探1井钻井资料，结合地震资料，分析了蓬探1井地层与沉积序列，探讨裂陷内灯二段台缘丘滩分布控制因素，指出下一步有利勘探区域。研究结果表明：①德阳—安岳裂陷北段灯影组地层序列表现为灯四段缺失，灯三段与下寒武统麦地坪组假整合接触；②德阳—安岳裂陷内灯二段发育受同沉积断层控制的丘滩体，微生物碳酸盐岩发育；③灯二段储层以藻砂屑云岩、藻凝块云岩为主，溶蚀孔洞发育，储层储集物性良好； ④灯二段含气性良好，测井解释气层厚度为119.26m，气水界面为-5550m。研究认为裂陷内灯二段发育多排断阶控制的台缘丘滩带，与寒武系筇竹寺组烃源岩直接接触，近源成藏条件优越，是规模勘探的重要领域。2020年5月4日蓬探1井在灯二段测试获天然气121.98×104m3/d，展示裂陷内灯二段具有较大勘探潜力。

关键词: 德阳&mdash, 安岳裂陷；灯二段；断控型台缘带；同沉积断层；构造&mdash, 岩性气藏

Abstract: Well Pengtan 1 is a risk exploration well located in the Deyang-Anyue rift in the Sichuan Basin, with the Sinian Dengying Formation as the main target layer. Its objective is to explore the reservoirs and gas-bearing properties of the Dengying Formation in the main hydrocarbon kitchen area in the rift. Based on drilling data from Well Pengtan 1, combined with seismic data, this paper analyzes the stratigraphic and sedimentary sequence in Well Pengtan 1, discusses the controlling factors of the distribution of platform margin mound-beach facies in the 2nd member of Dengying Formation (hereinafter Deng-2 member) in the rift, and indicates the most favorable area for the next stage of exploration. The research results show that: ① The stratigraphic sequence of the Dengying Formation in the northern part of the Deyang-Anyue rift is characterized by the fact that the 4th member of Dengying Formation (hereinafter Deng-4 member) is missing in that area, and by the disconformity between the 3rd member of Dengying Formation (hereinafter Deng-3 member) and the Maidiping Formation of the Lower Cambrian. ② In the Deyang-Anyue rift, mound-beach bodies controlled by synsedimentary faults are developed in the Deng-2 member, as well as microbial carbonate rocks. ③ The lithology of reservoir in the Deng-2 member is mainly algal dolarenite and algal thrombolite dolomite. Dissolution vugs are well developed and the reservoir physical properties are good. ④ The gas-bearing properties of the Deng-2 member are good. According to well logging interpretation, the thickness of the gas layer is 119.26 m, and gas-water contact is at 5550 m. According to research, several rows of platform margin mound-beach belts controlled by fault terrace are developed in the Deng-2 member in the rift, which is in direct contact with the hydrocarbon source rocks of the Cambrian Qiongzhusi Formation. The conditions for near-source hydrocarbon accumulation are favorable. It is therefore an important field for large-scale exploration. On May 4, 2020, natural gas of 121.98×104 m3/d was tested in Deng-2 member from well Pengtan 1, which shows great exploration potential.

Key words: Deyang-Anyue rift, the second member of the Dengying Formation, fault-controlled platform margin belt, synsedimentary fault, structural-lithologic gas reservoir

中图分类号:

赵路子, 汪泽成, 杨雨, 段书府, 魏国齐, 罗冰, 文龙, 马石玉, 冯庆付, 刘静江, 孙夕平, 谢武仁. 四川盆地蓬探1井灯影组灯二段油气勘探重大发现及意义[J]. 中国石油勘探, 2020, 25(3): 1-12.

Zhao Luzi, Wang Zecheng, Yang Yu, Duan Shufu, Wei Guoqi, Luo Bing, Wen Long, Ma Shiyu, Feng Qingfu, Liu Jingjiang, Sun Xiping, Xie Wuren. Important discovery in Well Pengtan 1 in the second member of the Dengying Formation in the Sichuan Basin and its significance[J]. China Petroleum Exploration, 2020, 25(3): 1-12.

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