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Evaluation Methods and Indexes for Ultra-deep Petroleum Reservoir preservation with Case Studies

Acta Geologica Sinica(English Edition) 2022年第4期96卷 1388-1401页

作者： YUAN Yusong WANG Guojian HU Wenxuan CHEN Shuping WANG Xiaolin ZOU Yu WANG Xinpeng ZHANG Rongqiang HAO Yunqing Research Institute of Petroleum Exploration and Development SinopecBeijing 100038China School of Earth Science and Engineering Nanjing UniversityNanjing 210008China School of Geosciences Chinese University of Petroleum(Beijing)Beijing 102200China

Following consideration of the characteristics of high temperature,high pressure and high in-situ stress in ultradeep sedimentary basins,together with the existence of hydrocarbon phase state transformation,hydrocarbon-water-rock interaction and rock mechanical property transition at those depths,the evaluation index system for hydrocarbon preservation was *** physical leakage evaluation indexes can be divided into three categories:the dynamic efficiency indexes of micro-sealing,caprock integrity and natural gas *** chemical loss evaluation indexes can be divided into two categories:the thermochemical sulfate reduction(TSR)index in marine gypsum-bearing carbonate strata and the thermochemical oxidation of hydrocarbons(TOH)index in clastic *** slippage angle and overconsolidation ratio(OCR)are the key evaluation indexes in the evaluation of the integrity of shale *** intensity can be quantitatively calculated by use of the Zn PVT state parameter *** TOH strength can be used to estimate the degree of hydrocarbon chemical loss,based on the TOH-related authigenic calcite cement content or the degree of negativeδ^(13)C of authigenic *** the evaluation of ultra-deep preservation in specific areas,key indexes can be selected according to the local geological conditions,instead of all indexes needing to be evaluated for every scenario.

关键词： ultra-deep hydrocarbon preservation physical leakage chemical loss thermochemical sulfate reduction thermochemical oxidation of hydrocarbons

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Regional Geochemistry and Fluid Flow in the Palaeogene Aquifers of the Gaoyou Subbasin in the Southern Part of North Jiangsu Basin, China

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 946-955页

作者： LI Mei Shanghai Geotechnical Investigations & Design Institute Co. Ltd

Chemical analysis of groundwater in petroliferous basins can be an effective way to determine the regional hydrogeological regime and to evaluate the preservation conditions of hydrocarbons. This paper presents the hydrochemical distribution of both individual aquifers and different structural units within the Palaeogene strata of the Gaoyou subbasin in the North Jiangsu Basin, east China. The results show that the salinity of the Palaeogene aquifers in the Gaoyou subbasin displays a systematic increase from the central deep depression to the periphery areas, and shows a reverse trend as the burial depth increases. Salinity maps of individual aquifers suggest that formation water in the deep layers at the centre of the study area probably retains original features of fresh lake water. Geofluids near the central deep depression of the Gaoyou subbasin migrate vertically through the Zhenwu and Hanliu faults, while those of the northern slope belt mainly flow laterally through aquifers. Both low and high salinity formation water can be found in the hydrocarbon producing areas. The low salinity zones commonly affected by infiltrated meteoric water are unfavourable conditions for the preservation of trapped hydrocarbons.

关键词： regional hydrogeology hydrochemistry hydrocarbon preservation North Jiangsu Basin

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