四川盆地奥陶系岩相古地理与勘探潜力

发布时间：2018-06-04 11:34

本文选题：四川盆地 + 奥陶纪　；参考：《海相油气地质》2017年04期

【摘要】：在前人研究基础上,依托露头和钻井资料,以沉积相分析为核心,结合四川盆地构造演化,采用单因素分析多因素综合法,以"组"为单元编制了奥陶纪岩相古地理图。奥陶纪四川盆地及邻区总体呈现西高东低的古地理格局,自西向东发育滨岸相、混积潮坪相、局限台地相、开阔台地相和斜坡相—盆地相。从岩相古地理视角对成藏条件的分析表明:奥陶系五峰组沉积期四川盆地主体属于局限海环境,发育了一套优质烃源岩,此外,与奥陶系临近的上覆志留系龙马溪组和下伏寒武系筇竹寺组烃源岩在有断层沟通的情况下可提供有效气源;奥陶系碳酸盐岩总体致密,白云石化、表生溶蚀和裂缝的存在是储层形成的关键因素,对应发育了桐梓组—红花园组颗粒滩白云岩储层、岩溶储层和宝塔组裂缝储层等三类储层;奥陶系发育下部(下生上储)和上部(上生下储)两套成藏组合,具有较好的勘探潜力。
[Abstract]:On the basis of previous studies, based on outcrop and drilling data, with sedimentary facies analysis as the core, combined with structural evolution of Sichuan Basin, single factor analysis and multi-factor synthesis method were used to compile the lithofacies paleogeography map of Ordovician with "formation" as the unit. In the Ordovician Sichuan basin and its adjacent area, the paleogeographic pattern of west, high, east and low is generally present. From west to east, there are littoral facies, mixed tidal flat facies, restricted platform facies, open platform facies and slope facies-basin facies. From the point of view of lithofacies and paleogeography, the analysis of reservoir forming conditions shows that the main body of Sichuan basin in Wufeng formation of Ordovician belongs to a limited sea environment, and a set of high quality source rocks are developed. The source rocks of the Silurian Longmaxi formation and the Lower Cambrian Qiongzhusi formation adjacent to the Ordovician can provide an effective gas source under the condition of fault communication, the Ordovician carbonate rocks are compact in general and dolomitization, The existence of supergene dissolution and fracture is the key factor of reservoir formation, corresponding to the development of three types of reservoirs, such as Tongzi formation-Hongyuan formation granular beach dolomite reservoir, karst reservoir and Baota formation fracture reservoir. The Ordovician developed two sets of assemblages of lower (lower upper reservoir) and upper part (upper generation and lower reservoir), which have good exploration potential.
【作者单位】：中国石油勘探开发研究院;中国石油西南油气田分公司;
【基金】：国家科技重大专项“下古生界—前寒武系碳酸盐岩油气成藏规律与勘探方向”(编号:2016ZX05004-001) 中国石油天然气股份有限公司重大科技专项“深层大油气田形成与分布”(编号:2014E-32-01)资助
【分类号】：P618.13

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