川东高陡构造带震旦系灯影组丘滩相气藏预测  

Prediction for mound-beach gas reservoirs of Sinian Dengying Formation in high-steep structural belt,eastern Sichuan Basin

作　　者：周刚[1] 文龙[2] 王文之[1] 张本健[1] 严威[1] 魏朋辉 蒋航 和源 汪华[1] 卞艳红 曾云贤[1] 杨岱林 ZHOU Gang;WEN Long;WANG Wenzhi;ZHANG Benjian;YAN Wei;WEI Penghui;JIANG Hang;HE Yuan;WANG Hua;BIAN Yanhong;ZENG Yunxian;and YANG Dailin(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Geoscience Solutions Company,Beijing,100102,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院 [2]中国石油西南油气田公司 [3]北京源烃泰克科技有限公司

出　　处：《天然气勘探与开发》2023年第3期1-13,共13页Natural Gas Exploration and Development

摘　　要：在川东高陡构造带内,构造复杂、地震资料差,寻找震旦系灯影组油气富集带具有重大挑战。为此,运用构造形迹分析构造期次,环状构造结合地震相特征预测藻丘滩;丘滩相特征结合构造形迹期次分析WT1井失利原因;综合丘滩相与构造的叠合关系以预测开江地区灯影组油气富集带。结果表明:①开江地区的NE构造主体为川东高陡构造带在燕山中晚期挤压形成,喜山期强烈改造定型。②EW向低幅度构造为大巴山于晚燕山期弱挤压形成。③SN向构造形成于喜马拉雅晚期,动力来自龙门山南段挤压。④燕山中晚期的NE构造与裂解气富集晚期匹配。发育大量的环状构造,为藻丘滩刚性地质体形成,为古岩性圈闭,与原油成藏期匹配。⑤环状构造+NE向构造是油气富集带。综合构造形迹与地震相预测了多个油气目标:七里南背斜内的七3环是最有利目标,藻丘滩地震相最为明显,且叠加NE向构造;铁1环是现实的目标;里1环是潜在的目标区。环状构造在开江地区大量存在,具有较好的油气勘探远景。It is a great challenge to find hydrocarbon-enriched zones of the Sinian Dengying Formation in the high-steep structural belt of eastern Sich-uan Basin,with the complex structures and poor seismic data.For this reason,some analyses and predictions were carried out,including:tectonic period analysis by structural features,the prediction for algal mound beach by ring structure and seismic facies characteristics,the analysis on failure of Well Wutan-1 according to the characteristics of mound-beach facies and structural features and periods,and the prediction for hydrocarbon-enriched zones of the Dengying Formation in Kaijiang area based on the superimposed relationship between mound-beach facies and structure.The results are obtained in five aspects.(i)The main NE-trending structure in Kaijiang area was formed by the compressional movement of the high-steep structural belt during the middle-late Yanshan period,and its strong transformation was finalized during the Himalayan period.(ii)The EW-trending low-amplitude structure was formed by the weak compression of Daba Mountain during the late Yanshan period.(iii)The SN-trending structure was formed during the late Hi-malayan period by the compression of the southern Longmen Mountain.(iv)The NE-trending structure in the middle-late Yanshan period matches the late period of pyrolysis gas enrichment.There develops a large number of ring structures,which were formed by algal-mound-beach rigid terrains.They are paleo-lithologic traps,matching the oil accumulation period.(v)The ring structure plus NE-trending structure indicates hydrocarbon-enriched zone.Several oil and gas targets were predicted by combining the structural features with seismic facies.Result shows that,the Qi-3 ring in Qilinan anticline is the most favorable target,with the most obvious algal-mound-beach seismic facies,and superimposed with the NE-trending structure;the Tie-1 ring is a realistic target;and the Li-1 ring is a potential one.The ring structures are abundant in the Kaijiang area,which have a

关 键 词：川东高陡构造带 开江古隆起 灯影组 藻丘滩 构造形迹 环状构造 

分 类 号：P618.13[天文地球—矿床学]