川西南部灯影组展布特征新认识及油气地质勘探意义

doi:10.3969/j.issn.1672-7703.2020.03.006

摘要/Abstract

摘要： 四川盆地震旦系灯影组勘探成效显著、潜力巨大。对四川盆地川西南部开展野外露头、岩心岩石学特征和地球化学分析，并结合地震资料综合研究认为：川西南部汉王场构造汉深1 井震旦系灯影组具有贫藻富硅、 Ca及Mg含量相对低、Si含量高、δ13C及δ18O偏低的特征，与灯四段在岩性特征、常量元素和同位素含量上基本一致，所钻揭的灯影组层位归属为灯四段；井震结合预测，川西南部灯四段主要在成都—犍为以西地区分布，厚 200～300m，在盆地内分布面积达1.5×104km2，向南一直延伸到西昌、云南地区。灯四段厚度向德阳—安岳裂陷内逐渐减薄，具有缓坡型台地边缘特征。川西南部地区灯四段储层发育，紧邻裂陷槽内寒武系优质烃源岩，成油期处于古隆起高部位，发育古油藏，后期历经多次构造运动，油裂气重新调整聚集，具备形成构造型、构造—岩性复合型、构造—地层复合型等气藏的地质条件，邛崃—大兴场—眉山地区是勘探的有利区带。

关键词: 四川盆地, 灯影组, 地层展布, 同位素, 成藏条件, 缓坡型台缘

Abstract: The Dengying Formation of the Sinian system in the Sichuan Basin has significant consequences for exploration and great potential. Analysis of the petrological and geochemical characteristics of outcrops and cores in the southwestern Sichuan Basin was carried out in combination with seismic data. Comprehensive study shows that the Sinian Dengying Formation in Well Hanshen 1, which is located in the Hanwangchang structure in southwestern Sichuan, is characterized by poor algae content, rich silicon content, relatively low Ca and Mg contents, high Si content, and low δ13C and δ18O contents. This is basically consistent with the 4th member of Dengying Formation (hereinafter Deng-4 member) in terms of lithologic characteristics, major elements and isotopic content, and it is therefore considered that the penetrated stratum is the Deng-4 member of Dengying Formation. According to the prediction of well-seismic combination, the Deng-4 member in the southwestern Sichuan Basin is mainly distributed in the west of the Chengdu-Qianwei area, with a thickness of 200?300 m and a distribution area of 1.5×104 km2 in the basin, extending southward to the Xichang and Yunnan areas. The Deng-4 member gradually thins towards the Deyang-Anyue rift, which is characterized by gentle slope type platform margin. The reservoirs in the Deng-4 member are well developed in the southwestern Sichuan area, which is close to Cambrian high-quality source rocks in the rift. In the oil generation stage, the reservoirs were located at the high position of the paleo-uplift, so that paleo oil reservoirs were formed. In the later stage, after several tectonic movements, oil cracking gas was re-adjusted and re-accumulated. This provided the geological conditions to form gas reservoirs of structural type, structural-lithologic type and structural-stratigraphic type. The areas of Qionglai-Daxingchang-Meishan are favorable zones for petroleum exploration.

Key words: Sichuan Basin, Dengying Formation, stratigraphic distribution, isotope, hydrocarbon accumulation conditions, gentle slope type platform margin

中图分类号:

文龙, 王文之, 李林娟, 洪海涛, 罗冰, 张玺华, 彭瀚霖, 李堃宇, 贾敏, 田兴旺. 川西南部灯影组展布特征新认识及油气地质勘探意义[J]. 中国石油勘探, 2020, 25(3): 56-65.

Wen Long, Wang Wenzhi, Li Linjuan, Hong Haitao, Luo Bing, Zhang Xihua, Peng Hanlin, Li Kunyu, Jia Min, Tian Xingwang. New understandings of the distribution characteristics of the Sinian Dengying Formation in the southwestern Sichuan Basin and its significance for oil and gas geological exploration[J]. China Petroleum Exploration, 2020, 25(3): 56-65.

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