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Mechanism of carbonate cementation and its influence on reservoir in Pinghu Formation of xihu sag

Acta Oceanologica Sinica 2023年第3期42卷 65-75页

作者： Haiqiang Bai Xiaojun Xie Gongcheng Zhang Ying Chen Ziyu Liu Lianqiao Xiong Jianrong Hao Xin Li China National Offshore Oil Corporation(CNOOC)Research Institute Co. Ltd.Beijing 100028China

Carbonate cements are the most abundant authigenic mineral and impact on physical properties greatly in sandstone *** this paper,Pinghu Formation of xihu sag was taken as a ***,distribution and formation of carbonate cements were investigated via optical microscopy,cathodoluminescence(CL),electron probe and in-situ carbon-oxygen *** results showed that carbonate cements varied in types and ***/dolomite mainly present as poikilotopic cements,while ferrocalcite/ferrodolomite/ankerite generally present as pore-filling *** isotope(δ^(13)C)values of carbonate cements were ranging from–7.77‰to–2.67‰,with an average of–4.52‰,while oxygen isotope(δ^(18)O)values were ranging from–18.94‰to–12.04‰,with an average of–14.86‰.Theδ^(13)C/δ^(18)O indicated that the paleo-fluid of carbonate cement was mainly *** carbon mainly came from organic matter within mature source rocks,and inorganic carbon came from dissolution of carbonate debris and early carbonate ***δ^(13)C/δ^(18)O values manifest that carbonate cements with different types formed in different periods,which make different contributions to the reservoir ***/dolomite formed during eodiagenesis(70–90℃)and early mesodiagenesis stage(90–120℃),and were favorable to reservoir owing to their compacted resistance and selective ***/ferrodolomite/ankerite formed during middle-late mesodiagenetic stage(above 120℃),and were unfavorable to reservoir due to cementing the residual intergranular ***,in order to evaluate the reservoir characteristics,it is of significantly important to distinguish different types of carbonate cements and explore their origins.

关键词： carbonate cements genesis mechanism xihu sag Pinghu Formation

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Studies on the Inversion Phenomenon of Physical Properties Observed in the Huagang Formation Reservoir in the xihu sag Based on the Water-Rock Reaction Experiments

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Journal of Ocean University of China 2021年第4期20卷 755-764页

作者： HUANG Siqin XU Fanghao XU Guosheng CUI Hengyuan ZHANG Wu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China CNOOC(China)Co. Ltd.Shanghai CompanyShanghai 200030China

In the xihu sag,the reservoirs of the Paleogene Huagang formation have entered the middle diagenetic stage A and the rock physical properties of the water layer are considerably more suitable for the gas migration and storage than those of the present gas layer,indicating the inversion of the physical *** this study,core samples were collected from the corresponding reservoir to conduct water-rock reaction experiments in acidic,alkaline,and neutral systems under the specific temperature and *** reasons for the inversion of physical properties were investigated based on the experiment results in reservoir diagenetic *** inversion of physical properties can be attributed to the fact that the diagenetic environment around the gas-water interface controls the water-rock reaction *** different types of acidic substances,two different situations corresponding to inverted physical properties were analyzed along with the corresponding *** the pore fluid is acidic,the physical properties make the overall water layer a better reservoir space than the gas layer,which can be referred to as the overall inversion of physical *** the fluid were generally neutral or weakly alkaline and the gas layer was rich in CO2,only the physical properties of the water layer adjacent to the gas-water interface were more favorable for the gas migration than those of the gas *** phenomenon can be referred to as the near-interface inversion of physical properties.

关键词： xihu sag water-rock reaction reservoir evolution inverted physical properties diagenetic environment special phe-nomenon

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Defining stratigraphic oil and gas plays by modifying structural plays:A case study from the xihu sag,east China Sea Shelf Basin

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能源地球科学(英文) 2021年第1期2卷 41-51页

作者： Feng Ding Chunyu Xie Xinghai Zhou Cen Jiang Kun Li Lifeng Wan Pei Zhang Huawei Niu Shanghai Offshore Oil and Gas Exploration and Production Company SINOPECShanghai200120China

The study focuses on an area of relatively mature oil and gas exploration located in the western slope of the xihu sag,East China Sea Shelf *** stratigraphic oil and gas plays are introduced to replenish the shrinking prospect inventory in the *** reservoirs of these plays are traditional pay intervals of the Eocene Pinghu Formation and Baoshi Formation composed of tide-dominated delta front,tidal flat and delta front sand bar *** investigating conventional seismic data,seismic inversion volumes,and well log data,multiple tidal-influenced delta front channels,beach sand packages have been mapped out in different reservoir sand intervals of the Pinghu Formation and Baoshi *** recognize four types of stratigraphic terminations:channel flank pinch-outs,axial pinch-outs of sand-fills,channel mouth sand bar pinch-outs,and onlap pinch-outs for the Baoshi *** the depositional facies and relatively low sand-shale ratio of the reservoir formations favor the occurrence of stratigraphic *** closure mechanism of all these plays are similar to the traditional structure plays in the area:fault blocks or fault-bounded rollover anticlines,except that one or more closing faults are replaced by these stratigraphic *** small-sized closures should exist but the relatively large ones are centered around a major intra-slope rise,raising the exploration potential in this maturely explored *** new exploration drilling campaign has so far tested the play of delta front channel facies,with three out of four wells commercially *** play concepts open up a novel approach to identify new traps in the study area and many other rift basins with similar settings in eastern China.

关键词： East China Sea xihu sag Stratigraphic play Pinghu Formation

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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

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Fracture development and hydrocarbon accumulation in tight sandstone reservoirs of the Paleogene Huagang Formation in the central reversal tectonic belt of the xihu sag, East China Sea

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Petroleum Exploration and Development 2020年第3期47卷 499-512页

作者： ZHOU Xinhuai XU Guosheng CUI Hengyuan ZHANG Wu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China CNOOC China Limited Shanghai BranchShanghai 200030China

By using thin section identification, cathodoluminescence, major and trace elements and fluid inclusion tests and authigenic illite dating, based on observation of core cracks, combined with the microscopic characteristics and imaging logging characteristics of fractures, the stages of the fractures in the Huagang Formation of the central reversal tectonic belt of the xihu sag in the East China Sea, and the matching relationship between the fracture development stages and the oil and gas charging stages are clarified. There are diagenetic fractures and tectonic fractures in the reservoirs of the Huagang Formation in the study area. The diagenetic fractures developed during the diagenetic stage of the reservoirs and have less effect on oil and gas migration and transport. The tectonic fractures are divided into three stages based on tectonic movements controlling the fractures and their relationships with hydrocarbon charging: The first stage of fractures was generated in the early stage of the Himalayan Movement–Longjing Movement(12–13 Ma ago), when the tectonic stress caused the sutures and shale strips to twist, deform, and break. Tectonic microfractures generated in this period had short extension, narrow width, and poor effectiveness, and had little effect on oil and gas migration and transport. The second stage of fractures came up during the middle-late period of Himalayan Movement–Longjing Movement(9–12 Ma ago), when tectonic movements caused the development of tectonic fractures in the central reversal tectonic belt, these fractures are of large scale, long extension, and good effectiveness, and matched with the first stage of large scale oil and gas charging(9–12 Ma ago), so they play an important role in oil and gas migration, transportation, and accumulation. The third stage of fractures were created from Himalayan Movement–Okinawa Trough movement to the present day(0–3 Ma ago), the fractures are tectonic ones developing successively;matching with the sec

关键词： authigenic illite fluid inclusion analysis fracture characteristics oil and gas charging Paleogene Huagang Formation xihu sag

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