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Application of mapping and dating techniques in the study of ancient carbonate reservoirs: A case study of Sinian Qigebrak Formation in northwestern tarim basin, NW China

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Petroleum Exploration and Development 2020年第5期47卷 1001-1013页

作者： YANG Hanxuan HU Anping ZHENG Jianfeng LIANG Feng LUO Xianying FENG Yuexing SHEN Anjiang PetroChina Hangzhou Research Institute of Geology(HIPG) Hangzhou 310023China Key Laboratory of Carbonate Reservoirs CNPCHangzhou 310023China Radiogenic Isotope Facility School of Earth and Environmental SciencesThe University of QueenslandBrisbaneQLD 4072Australia

Ancient marine carbonates experienced complex modifications,making it difficult to identify reservoir genesis and effective porosity before hydrocarbon *** solve these issues,we used element mapping and carbonate mineral laser U-Pb radiometric dating techniques to study the diagenetic environments based on geochemistry and diagenesis-porosity evolution based on geochronology of the dolomite reservoir of the Sinian Qigebrak Formation,northwest tarim *** major understandings were obtained as follows:(1)Supported by petrographic observations,the element mapping,stable isotopes,strontium isotope,and cathodoluminescence tests were performed on different phases of dolomite cements precipitated in vugs and dissolved *** results show that the dolomite reservoirs of the Qigebrak Formation went through freshwater,marine,extremely shallow burial,burial and hydrothermal diagenetic environments after synsedimentary dolomitization;the reservoir spaces were mainly formed in the synsedimentary period(primary pores)and freshwater environment(supergene dissolution pores)before burial;whereas the marine,burial and hydrothermal environments caused the gradual filling of reservoir space by dolomite cements.(2)Based on the above understandings,each phase of dolomite cement precipitated in the reservoir space was dated by the U-Pb radiometric dating technique,and the diagenesis-porosity evolution curves constrained by geochronology were *** loss of reservoir porosity mainly occurred in the early Caledonian,and during the peak period of hydrocarbon generation of Yuertusi Formation source rock,the reservoirs still maintained at a porosity of 6%?10%.The above understandings provide a certain basis for the evaluation of accumulation effectiveness of the Sinian Qigebrak Formation,northwestern tarim basin,and provide a case for the application of mapping and dating techniques in the study of ancient carbonate reservoirs.

关键词： U-Pb dating mapping Sinian Qigebrak Formation northwestern tarim basin diagenetic environment diagenesis-porosity evolution

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Late Cenozoic transtensional fault belt discovered on the boundary of the Awati Sag in the northwestern tarim basin

Late Cenozoic transtensional fault belt discovered on the bo...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Yue?Jun Li Qiang Zhang Guang?Ya Zhang Hai?Jun Yang Xian?Zhang Yang Jun Shi Yuan Neng Yan?Gui Chen Lei Wen Institute of Geology and Geophysics Chinese Academy of Sciences Research Institute of Petroleum Exploration and Development Petro China tarim Oilield Company PetroChina

Late Cenozoic transtensional fault belt was discovered on Shajingzi fault belt,NW boundary of the Awati Sag in the northwestern tarim *** numerous Quaternary normal faults were discovered on Aqia and Tumuxiuke fault belts,SW boundary of *** discovery reveals Quaternary normal fault activity in the tarim basin for the irst *** is also a new discovery in the southern flank of Tianshan *** transtensional fault belt is made up of numerous,small normal ***,the normal faults are arranged in right-step,en echelon patterns along the preexisting Shajingzi basement fault,forming a sinistral transtensional normal fault *** proile,they cut through the Paleozoic to the mid-Quaternary and combine to form negative flower *** Late Cenozoic normal faults on the SW boundary of Awati Sag were distributed mainly in the uplift side of the preexisting Aqia and Tumuxiuke basement-involved faults,and combined to form small horst and graben structures in *** on the intensive seismic interpretation,careful fault mapping,and growth index analysis,we conclude that the normal fault activity of Shajingzi transtensional fault belt began from Late Pliocene and ceased in Late Pleistocene(mid-Quaternary).And the normal faulting on the SW boundary of Awati Sag began from the very beginning ofQuaternary and ceased in *** normal faulting on Awati’s SW boundary began a little later than those on the NW *** origin of Shajingzi transtensional normal fault belt was due to the left-lateral strike-slip occurred in the southern flank of Tianshan,and then,due to the eastward escape of the Awati block,a tensional stress developed the normal faults on its SW boundary.

关键词： Pliocene–Pleistocene normal fault Late Cenozoic transtensional normal fault belt Left-lateral strike-slip Awati Sag northwestern tarim basin Southern flank of Tianshan Mountains Seismic interpretation

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