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Energy Geoscience 2024年第1期5卷 275-282页

作者： Wenbo Zheng Guofeng Yin Li Sun Shuijian Wei Xiuping Wei Bo Niu Petroleum Exploration and Production Research Institute of SINOPEC Beijing100083China Shanghai Offshore Oil&Gas Branch SINOPECShanghai200120China

The Xihu Depression is the largest hydrocarbon-bearing depression of the east china sea shelf basin(also referred to as the ECSSB).However,the depositional systems and reservoir distribution of the Oligocene Huagang Formation in the Xihu Depression are still *** the guidance of sedimentology and stratigraphy,this study documented a marine-terrestrial transitional environment in the restricted bay setting of the Oligocene Huagang Formation through core description,well logging,and seismic data *** study also revealed that the Oligocene Huagang Formation is dominated by tidal delta,estuary,and gravity flow deposits in the central anticline zone of the Xihu *** new understanding of the sedimentary systems and the discovery of the transgressive gap in the eastern Diaoyu Islands uplift explain the origin of fine-grained sediments and the EW-trending sand bodies in the central depression and the sand bodies parallel to shoreline in the west slope belt,which cannot be explained by previous study results,such as southern transgression or fluvial deltas and even lacustrine ***,the tidal channels,tidal sand flats,and gravity flow sand bodies formed by the transgressive tides are high-quality *** study will provide a basis for well placement and serve as guidance for the selection of favorable hydrocarbon exploration areas in the Xihu Depression.

关键词： Estuary Sedimentary system Oligocene Huagang Formation Central anticline Xihu Depression east china sea shelf basin

New interpretation on the provenance changes of the upper Pinghu–lower Huagang Formation within Xihu Depression,east china sea shelf basin

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Acta Oceanologica Sinica 2023年第3期42卷 89-100页

作者： Jinshui Liu Shuai Li Kaifei Liao Yuchi Cui Lei Shao Peijun Qiao Yi Lu Yuanli Hou Thian Lai Goh Yongjian Yao Shanghai Branch of china National Offshore Oil Corporation(CNOOC)Co. Ltd.Shanghai 200030China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Earth Dynamics Research Group The Institute for Geoscience Research(TIGeR)School of Earth and Planetary SciencesCurtin UniversityGPO Box U1987Australia Department of Earth Sciences and Environment Faculty of Science and TechnologyUniversity Kebangsaan Malaysia43600 BangiSelangorMalaysia Guangzhou Marine Geological Survey Ministry of Natural ResourcesGuangzhou 510075China

Both Pinghu and Huagang formations are important hydrocarbon reservoirs of the Xihu Depression in the east china sea shelf *** the source suppliers and restoring source-to-sink transport routes are of great significance to the future petroleum and gas *** researchers were largely confined by either limitation of geological records,highly dependence on a singular method or low-precision dating *** study integrated heavy mineral assemblages,geochemical analyses and detrital zircon U-Pb dating to reconstruct multiple source-to-sink pathways,and to provide a better understanding on the provenance evolution for the upper Pinghu–lower Huagang depositions of the Xihu *** least three major provenances have been confirmed and systematically investigated for their separate compositional *** Hupijiao Uplift(or even farther northern area)was dominated by a major Paleoproterozoic population peaked at ca.1830 Ma along with minor Mesozoic *** Haijiao Uplift to the west and the Yushan Low Uplift to the southwest,on the other hand,generate opposite U-Pb age spectra with apparently larger peaks of Indosinian and Yanshanian-aged *** be noted,both Indosinian and Paleoproterozoic peaks are almost identical in proportion for the Haijiao *** overall sedimentary pattern of late Eocene-early Oligocene was featured by both spatial and temporal *** Hupijiao Uplift was likely to cast limited impact during the late Eocene,whereas the broad southern Xihu Depression was transported by a large abundance of materials from the nearby Haijiao and Yushan Low *** northern source substantially extended its influence to the farther south during the early Oligocene by delivering plentiful sediments of higher-degree metamorphic parent *** with the proximal western and southwestern suppliers,the overall Xihu Depression was under control from both distant and local provenances.

关键词： Xihu Depression east china sea shelf basin detrital zircon U-Pb ages Pinghu–Huagang Formation provenance

Origin of hydrocarbon fluids and discussion of abnormal carbon isotopic compositions in the Lishui-Jiaojiang Sag,east china sea shelf basin

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Acta Oceanologica Sinica 2023年第3期42卷 76-88页

作者： Jingqi Xu Shanghai Branch of china National Offshore Oil Corporation(CNOOC)Co. Ltd.Shanghai 200335China

The hydrocarbon gases in the L1 gas field of the Lishui-Jiaojiang Sag have been commonly interpreted to be an accumulation of pure sapropelic-type thermogenic *** this study,chemical components,stable isotopic compositions,and light hydrocarbons were utilized to shed light on the origins of the hydrocarbon fluids in the L1gas *** hydrocarbon fluids in the L1 gas pool are proposed to be a mixture of three unique components:mid-maturity oil from the middle Paleocene coastal marine Lingfeng source rock,oil-associated(late oil window)gas generated from the lower Paleocene lacustrine Yueguifeng source rock,and primary microbial gas from the paralic deposits of the upper Paleocene Mingyuefeng source ***,for the first time,the hydrocarbon gases in the L1 gas pool are diagnosed as mixed oil-associated sapropelic-type gas and microbial gas via four pieces of principal evidence:(1)The abnormal carbon isotopic distributions of all methane homologues from C_(1)(CH_(4)or methane)to C_(5)(C_(5)H_(12)or pentane)shown in the Chung plot;(2)the diagnostic~(13)C-depleted C_(1)compared with the thermogenic sapropelic-type gas model,whileδ^(13)C_(2)(C_(2)H_(6)or ethane)andδ^(13)C_(3)(C_(3)H_(8)or propane)both fit perfectly;(3)the excellent agreement of the calculated carbon isotopic compositions of the pure thermogenic gas with the results of the thermal simulated gas from the type-II1 kerogen-rich Yueguifeng source rock;and(4)the oil-associated gas inferred from various binary genetic diagrams with an abnormally elevated gas oil ***,the natural gases of the L1 gas pool were quantified in this study to comprise approximately 13%microbial gas,nearly 48%oil-associated sapropelic-type gas,and 39%of nonhydrocarbon *** microbial gas is interpreted to have been codeposited and entrained in the humic-kerogen-rich Mingyuefeng Formation under favorable lowtemperature conditions during the late Paleocene-middle *** microbial gas subsequently leaked into the stru

关键词： origin of hydrocarbons carbon isotope hydrogen isotope light hydrocarbon east china sea shelf basin Lishui-Jiaojiang Sag

Application of seismic sedimentology in characterization of fluvial-deltaic reservoirs in Xihu sag, east china sea shelf basin

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Petroleum Exploration and Development 2023年第1期50卷 138-151页

作者： LOU Min CAI Hua HE Xianke LIU Yinghui HUANG Xin ZHANG Xianguo LIU Huafeng Shanghai Branch of CNOOC Shanghai 200335China CNOOC Research Institute Co. Ltd.Beijing 100028China china University of Petroleum(east china) Qingdao 266580China

The fluvial-deltaic reservoirs of the Oligocene Huagang Formation in the Xihu sag of the east china sea shelf basin reflect rapid lateral change in sedimentary facies and poor morphology of conventional slice attributes,which bring difficulties to the reservoir prediction for subsequent exploration and development of lithologic *** traditional seismic sedimentology technology is optimized by applying the characteristic technologies such as frequency-boosting interpretation,inversion-conventional–90°phase shift joint construction of seismic lithologic bodies,nonlinear slices,paleogeomorphology restoration,and multi-attribute fusion,to obtain typical slice attributes,which are conducive to geological form description and sedimentary *** Huagang Formation developed three types of sedimentary bodies:braided river,meandering river and shallow water delta,and the vertical sedimentary evolution was controlled by the mid-term base-level cycle and *** the early–middle stage of the mid-term base-level ascending cycle,braided channel deposits were dominant,and vertical superimposed sand bodies were *** the late stage of the ascending half-cycle and the early stage of the descending half-cycle,meandering river deposits were dominant,and isolated sand bodies were *** the middle–late stage of the descending half-cycle,shallow-water delta deposits were dominant,and migratory medium–thick sand bodies were *** paleogeomorphology controlled the sand body distribution,while non-restricted paleogeomorphology had little effect on the sand body *** on reservoir characterization,the fault sealing type and reservoir updip pinch-out type structural lithological traps are proposed as the main directions for future exploration and development in the Xihu sag.

关键词： east china sea shelf basin Xihu sag Oligocene Huagang Formation fluvial-deltaic facies reservoir characterization seismic sedimentology

Diagenesis and Diagenetic Evolution of Deltaic and Neritic Gas-Bearing Sandstones in the Lower Mingyuefeng Formation of Paleogene, Lishui Sag, east china sea shelf basin: Implications for Depositional Environments and Sequence Stratigraphy Controls

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Acta Geologica Sinica(English Edition) 2015年第5期89卷 1625-1635页

作者： XU Fa ZHANG Penghui ZHANG Jinliang LIU Jinshui HOU Guowei ZHANG Ming LI Jingzhe LIU Shasha GUO Jiaqi MENG Ningning Shanghai Branch of CNOOC Ltd. Qingdao Institute of Marine Geology College of Resources Science & Technology Beijing Normal University College of Marine Geosciences Ocean University of China

Gas-bearing deposits in the Lower Mingyuefeng Formation of Paleogene, Lishui Sag, east china sea shelf basin consist of shoreface sandstones of the highstand systems tract（HST） and transgressive systems tract（TST）, and deltaic sandstones of the lowstand systems tract（LST） and falling stage systems tract（FSST）.Detailed petrographic observations suggest that the diagenetic features and related evolution of these deposits cannot be simply characterized and demonstrated in the depth ***, the occurrence of diagenetic minerals systematically depends on the studied interval within the HST, TST, LST, and FSST; therefore, diagenesis in this region can be better constrained when studied in the context of the depositional environments and sequence stratigraphic *** eogenetic processes in such settings include：（1） microcrystalline siderite precipitated as concretions in almost all environments and systems tracts, which inhibited further mechanical compaction;（2） grain dissolution and kaolinitization occurred in shoreface HST sandstones and deltaic LST and FSST sandstones;（3） glaucony was locally observed, which did not clearly reflect the controls of facies or sequence stratigraphy; and（4） cementation by pyrite aggregates occurred in the shoreface HST sandstones and deltaic LST *** mesogenetic diagenesis includes：（1） partial conversion of kaolinite into dickite in deltaic LST sandstones, and minor chlorite cementation in deltaic FSST sandstones;（2） transformation of kaolinite into illite and quartz cementation in deltaic LST and FSST sandstones;（3） frequent precipitation of ankerite and ferroan calcite in shoreface TST sandstones and early HST sandstones, forming baffles and barriers for fluid flow, with common calcite in shoreface HST sandstones as a late diagenetic cement; and（4） formation of dawsonite in the deltaic LST and FSST sandstones, which is interpreted to be a product of the invasion of a CO2-rich fluid, and acts as a good indicator o

关键词： diagenetic alteration depositional environment sequence stratigraphy reservoir quality Paleogene east china sea shelf basin

Depositional Responding to Tectonic Evolution of east china sea shelf basin

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Journal of Earth Science 1997年第1期16卷 56-61页

作者： Lu Yongchao Wu Fadong Xie Xinong Chen PingFaculty of Earth Resources, china University of Geosciences, Wuhan 430074 Zhou Ping Li Peilian Xu WeilingShanghai Institute of Offshore Petroleum Exploration and Development, MGMR, Shanghai 200120

? The east china sea shelf basin is a large marginal rift basin occurred in backarc area of west Pacific. Three main regional unconformities and eleven sequence boundary isochronous surfaces (hiatuses) were developed within the basin filling, which are separared the fill succession into three tectonic sequences and fourteen sequences. The depositional response of every tectonic sequence indicates the different phases in the evolution of basin and a specific filling process or filling pattern.

关键词： east china sea shelf basin sequence stratigraphy depositional response.