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Early Cambrian syndepositional structure of the northern Tarim Basin and a discussion of Cambrian subsalt and deep exploration

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Petroleum Exploration and Development 2019年第6期46卷 1141-1152页

作者： GUAN Shuwei ZHANG Chunyu REN Rong ZHANG Shuichang WU Lin WANG Lei MA Peiling HAN Changwei Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China Korla Branch of Geophysical Research Institute BGP Inc.Korla 841000China

Using field geological survey,drilling and seismic data,combined with the study of regional tectonic evolution and structural deformation,as well as lithological and sedimentary analysis,we reconstructed the basin filling process and paleo-geography of north Tarim Basin in Early Cambrian,aiming to analyze the factors controlling the distribution and spatial architecture of the subsalt reservoir and source units and to define the favorable exploration *** Late Sinian tectonic activities in the northern Tarim Basin were characterized by different patterns in different areas,which controlled the sedimentary pattern in the Early *** boundary faults of Nanhuaian rift basin in the south slope of Tabei uplift and the north slope of Tazhong uplift became reactivated in the Early Cambrian,forming two NEE and EW striking subsidence centers and depocenters,where the predicted thickness of the Yurtusi Formation could reach 250 *** the Xiaoerbulake period,the weak rimmed platform was developed in the hanging wall of syndepositional *** the Nanhuaian rift system in the Tadong and Manxi areas were uplifted and destroyed in the Late Sinian,and appeared as gently slope transiting toward the subsidence center in the Early *** former had the sedimentary features of hybrid facies platform and the latter had the sedimentary features of ramp *** black shale of the Yurtus Formation in the footwall of syndepositional fault and the reef bank of Xiaoerbulake Formation platform margin in the hanging wall in Early Cambrian constitute a predicable source-reservoir *** activity intensity of syndepositional fault controlled the thickness of black shale and the scale of the reef *** is suggested carrying out high accuracy seismic exploration to determine the location of Early Cambrian syndepositional faults,on this basis,to search the reef bank of Xiaoerbulake Formation along the faults westward,and then drill risk exploration we

关键词： Early Cambrian syndepositional structure bedded chert paleogeography subsalt exploration Lower Cambrian Yurtusi Formation Tarim Basin prototype basin

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Distribution and controls of petroliferous plays in subtle traps within a Paleogene lacustrine sequence stratigraphic framework, Dongying Depression, Bohai Bay Basin, Eastern China

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Petroleum Science 2020年第1期17卷 1-22页

作者： Ji-Chang Zhu Cai-Neng Zou You-Liang Feng Shu Jiang Wei-An Wu Ri-xiang Zhu Miao Yuan State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China Energy and Geoscience Institute(EGI) University of UtahSalt Lake CityUT 84108USA

The characteristics of petroliferous plays in subtle traps within a sequence stratigraphic framework in the Dongying Depression are investigated in this *** bodies within lowstand systems tracts(LSTs)of sequences,comprising incisedchannel fills,sublacustrine fans,deltas in LSTs,controlled by syndepositional normal faults,and sand bodies within transgressive systems tracts(TSTs)to early highstand systems tracts(HSTs),consisting of beach bars,and turbidites,controlled by the prodelta slope,paleorelief,and syndepositional normal faults,are good subtle *** and shale of deep lake subfacies in TSTs to early HSTs of sequences are source and cap *** overpressure is the dominant dynamic factor for hydrocarbon migration from source rock to the subtle *** faults,sand bodies,and unconformities function as conduit *** bodies distributed in the abnormal overpressure source rocks within LSTs to early HSTs are petroliferous plays in lithologic *** petroliferous plays in stratigraphic traps are controlled by unconformities at margins of the Depression.

关键词： Subtle traps Sand bodies within lowstand systems tract syndepositional normal fault Abnormal overpressure Dongying Depression

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