The Reservoir Modeling of Platform Margin Dolostone of Xiaoerblak Formation,Lower Cambrian,Kalpin Area,Tarim Basin
Received date: 2014-08-29
Revised date: 2014-12-01
Online published: 2015-07-10
The platform margin reef shoal dolostones of Cambrian in the Tarim Basin contain large scale qualitative reservoirs and have a promising exploration prospect.In this paper,the lithostratigraphic and reservoir characteristics of the platform margin dolostones were described,through fine measurement,thin section analysis and porosity test of seven recently found field sections of Xiaoerblak Formation,Lower Cambrian,Kalpin area.Moreover,the inner structure and reservoir lateral distribution of the platform margin belt were discussed and a semi-quantitative reservoir model of the platform margin dolostone was established by section sedimentary facies and reservoir correlation.According to the research results,Xiaoerblak Formation is divided into two members and the upper member is further divided into three sub-members.The lower member is mainly composed of micritic and crystalline dolostones,which indicates a low-energy subtidal environment in a ramp platform margin.The upper member is mainly composed of algal-laminated dolostones,microbial reef dolostones,pelletal dolostones and stromatolitic dolostones,which indicate a high-energy environment in a feebly rimmed platform margin.The dolostone reservoir of platform margin is controlled by sedimentary facies and develops dominantly in the granular beach dolostone of the upper sub-member Ⅱ and Ⅲ.The main reservoir spaces are corroded vug and recrystallized intercrystal pore,and the reservoir porosity ranges from 0.6% to 9.02%,with an average of 5.5%.The average thickness of reservoir is 30m to 40m and the width of reservoir is 25km at least.
LI Bao-hua,DENG Shi-biao,CHEN Yong-quan,LIU Pei-xian,ZHANG Yan-qiu,GUAN Ping,YAN Wei,JIN Yi-qiu . The Reservoir Modeling of Platform Margin Dolostone of Xiaoerblak Formation,Lower Cambrian,Kalpin Area,Tarim Basin[J]. Natural Gas Geoscience, 2015 , 26(7) : 1233 -1244 . DOI: 10.11764/j.issn.1672-1926.2015.07.1233
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