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The Major Controlling Factors and Different oolitic shoal Reservoir Characteristics of the Triassic Feixianguan Formation,Eastern Longgang Area,NE Sichuan Basin,SW China

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 895-908页

作者： GU Yifan JIANG Yuqiang LEI Xiaohua CHEN Zhiyong ZHOU Lu FU Yonghong JIANG Zengzheng School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Department of Geology University of ReginaReginaSaskatchewanSK S4S 0A2Canada Northeastern Sichuan Oil and Gas District PetroChina Southwest Oil and Gas Field CompanyDazhouSichuan 635000China Chongqing Gas Field PetroChina Southwest Oil and Gas Field CompanyChongqing 400021China Sichuan Geotech Science and Technology Ltd. Chengdu 610041China

Based on comprehensive analyses of occurrence,petrological observation,pore structure and geochemistry,the different reservoir characteristics and reservoir evolutionary pathways between different oolitic shoal reservoir types of the Feixianguan Formation on the west side of the Kaijiang-Liangping Trough have been studied.There exist three stages of high-energy slope break belts in the Feixianguan period,the corresponding three stages of oolitic shoals gradually migrating in the direction of the trough.Three types of oolitic shoal reservoirs,namely,residual-oolitic dolomite,mold-oolitic dolomite and sparry oolitic limestone,were formed during sedimentary-diagenetic evolution,the pore types being intergranular dissolved pore,mold pore(or intragranular dissolved pore)and residual intergranular pore,respectively.The petrology,physical properties and pore structure of the different types of oolitic shoal reservoirs are quite different.Residual-oolitic dolomite reservoirs have the best quality,while sparry oolitic limestone reservoirs have the poorest.Combined with analyses of trace elements,rare earth elements and carbon-oxygen isotopes,it is suggested that the formation of residual-oolitic dolomite reservoirs is jointly controlled by penesaline seawater seepage-reflux dolomitization and hydrothermal dolomitization.Mold-pore oolitic dolomite reservoirs are controlled by penesaline seawater seepage-reflux dolomitization and meteoric water solution.The burial dissolution of organic acid not only further improves the reservoir qualities of previously formed oolitic dolomite reservoirs,but also preserves residual intergranular pores in the sparry oolitic limestone reservoirs.

关键词： oolitic shoal reservoir evolution geochemical characteristics Triassic System Feixianguan Formation Sichuan Basin

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Effects of Diagenesis on the Acoustic Velocity of the Triassic oolitic shoals in the Yudongzi Outcrop of Erlangmiao Area,Northwest Sichuan Basin

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Journal of Earth Science 2012年第4期23卷 542-558页

作者：荣辉焦养泉吴立群顾元张利亚李荣曾凡平 Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Faculty of Earth Resources China University of Geosciences Faculty of Geophysics and Geomatics China University of Geosciences Department of Earth and Atmospheric Sciences University of Alberta BGP Dagang Branch BGP Inc.China National Petroleum Corporation

The oolitic shoals of the Triassic carbonate platform margin in the Yudongzi （鱼洞子） outcrop of Erlangmiao （二郎庙） area in the northwestern Sichuan （四川） basin present a scarce opportunity to quantitatively describe their diagenesis and its effects on the acoustic velocity. Using a detailed field geologic survey, profiles illustration of typical depositional system, and systematic testing, five types of diagenesis have been identified in the oolitic shoals： micritization, cementation, compaction and pressolution, dissolution, and dolomitisation. The cementation is composed of four subtypes （micrite cements, fibrous calcite cements, granular calcite cements, and blocky calcite cements）. The dissolution is formed from three subtypes （freshwater selective dissolution, burial non-selective dissolution, and burial selective dissolution）. The dolomitisation is composed of three subtypes （fine-crystalline dolomites, microcrystalline dolomites, and medium-crystalline dolomites）. In order to quantitatively describe the diagenetic fabric of oolitic shoals, the micritic grain content, calcite cement content, mean pore diameter, pore types, dolomite content, and dolomite types have been evaluated. Based on these data, the relationship between the acoustic velocity and diagenesis of oolitic shoals hasbeen established. The results show that the diagenetic fabric is linearly related with the acoustic velocity, and the general trend observed is as expected a decrease of velocity as the micritic grain content, mean pore diameter and dolomite content increase, or the sparite cement content decreases. This study will demonstrate that the transformation of diagenetic facies will probably make the petrophysicai properties ofEffects of Diagenesis on the Acoustic Velocity of the Triassic oolitic shoals in the Yudongzi Outcropthe oolitic shoals regularly changed. The reflection configuration of diagenetic facies in the oolitic shoals can be shown in the synthetic seismic model simulated according to the P-wave impedance and S-wave impedance.

关键词： oolitic shoal diagenesis acoustic velocity Feixianguan Formation Sichuan basin.

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