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Ultra-deep carbonate basement reservoirs formed by polyphase fracture-related karstification in the Offshore Bohai Bay Basin, China

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Petroleum Science 2023年第4期20卷 2009-2025页

作者： Jian Luo Hai-Yang Cao Domenico Chiarell Ru-Lin Miao Tao Ye Yun-Long Xu An-Qing Chen Xiao-Ping Luo State Key Laboratory of Oil&Gas Reservoir Geology and Exploration(Chengdu University of Technology) ChengduSichuan610059China Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications MNR&Institute of Sedimentary GeologyChengdu University of TechnologyChengduSichuan610059China Department of Earth Sciences Royal Holloway University of LondonSurreyTW200EXUnited Kingdom Tianjin Branch of China National Offshore Oil Company Ltd. Tianjin300452China Exploration and Development Research Institute Zhongyuan Oilfield CompanySINOPECPuyangHenan457001China

The Palaeozoic carbonate basement of the Offshore Bohai Bay Basin (OBBB) presents considerable potential for hydrocarbon exploration. However, the multistage tectonism and complex superimposed palaeo-karstification in the area are unclear, which leads to a lack of understanding on the formation mechanism and distribution of the deep carbonate basement reservoirs. In this study, the occurrence of a fracture-vug network and its fillings in carbonate reservoirs were investigated based on borehole cores, thin sections, and image logs from the southwestern slope of the OBBB's Bozhong Sag. Then the diagenetic fluid properties of the carbonate matrix and fillings were analysed via the data of carbon, oxygen, and strontium isotopes, and major, rare elements from coring intervals. The results revealed that fracture-related karst reservoirs have lithologic selectivity inclined toward dolomite strata. The intersecting relationships, widths, and strikes of the fractures and the regional tectonic background indicate three structural fracture families: NW-, NNE-, and NNW- trending, related to the Indosinian, middle Yanshanian, and late Yanshanian orogeny, respectively. The Indosinian NW- and end-Mesozoic NNE-trending fractures produced by compressional tectonic stress mainly contributed to the formation of the basement reservoirs. The geochemistry of the calcite veins filling these fractures suggests two main types of diagenetic fluids. The fluid of autogenic recharge related to the earlier fills is karstification diffuse flow dominated by internal runoff from rainfall in the highland setting of the Indosinian thrusting orogenic belt. The other fluid of allogenic recharge related to the later fills is the main lateral freshwater flow dominated by external runoff from the catchment in the setting of the horst-lowland within the rifting basin, induced by the Yanshanian destruction of the North China Craton. Finally, the relationship between the three fracture families and two kinds

关键词： Carbonate basement reservoirs Buried hill Diagenetic fluid fracture system Karstification Bohai bay basin

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Mechanical　features　of　Shanxi　Datong　earthquake　swarm　sequence　and　their　numerical　siamulation　by　using　finite　element　　method

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Acta Seismologica Sinica(English Edition) 1995年第1期8卷 13-23页

作者：张之立田华刘新美刘国民 1. Institute of Geophysics State Seismological Bureau 100081 Beijing China

The seismicity characteristics of the earthquake swarm occurred in Datong area in Shanxi Province during 1989-1993 period are studied in detail. The focal mechanisms and rupture processes of the principal earthquakes in itare also estimated in this paper. A mechanical model of fracture system of asymmetrical conjugate array is suggested from the view point of fracture propagation in order to simulate the mechanical features in the seismicsource respect of the Datong swarm sequence. The computation results of displacement field, stress field andstrain energy distribution from this model by using finite element method are presented. In addition, somerecorded data of geothermal precursors before these three climaxes of the Datong earthquake swarm sequence arediscussed mainly in this paper.

关键词： seismic source process fracture system numerical modelling

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A Comprehensive Evaluation Method for Low-permeability Reservoirs

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Petroleum Science 2005年第4期2卷 9-13页

作者： Zeng Lianbo Wang Zhengguo Zhang Guibin Key Laboratory for Hydrocarbon Accumulation of Ministry of Education China University of Petroleum Beijing 102249 China Faculty of Geoscience China University of Petroleum Beijing 102249 China

According to the geological characteristics and their influential factors of the low-permeability reservoirs, a comprehensive method for evaluation of low-permeability reservoirs is put forward. The method takes a matrix system as the basis, a fracture system as the focus and a stress field system as the restricted factor. It can objectively reflect not only the storage capability and seepage capability of low-permeability reservoirs, but also the effect on development as well. At the same time, it can predict the seepage characteristics at different development stages and provide a reasonable geological basis for the development of low-permeability reservoirs.

关键词： Matrix system fracture system stress field system low-permeability reservoir comprehensive evaluation

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