柴西地区下干柴沟组上段湖相碳酸盐岩沉积特征及相模式

doi:10.12108/yxyqc.20180401

Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (4): 1-13.doi: 10.12108/yxyqc.20180401

Depositional characteristics and facies model of lacustrine carbonate rocks in the upper member of lower Ganchaigou Formation in western Qaidam Basin

WANG Jiangong^1,2, ZHANG Daowei³, YI Dinghong¹, YUAN jianying^1,2, SHI Yajun¹, MA Xinmin¹, GAO Yanfang¹, ZHANG Ping¹, WANG Peng³

1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
2. Key Laboratory of Reservoir Description, CNPC, Lanzhou 730020, China;
3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China

Received:2018-01-05 Revised:2018-03-01 Online:2018-07-21 Published:2018-07-21

Abstract

Abstract: Thick and broad lacustrine carbonate sediments developed in the upper member of the lower Ganchaigou Formation(E₃²)in western Qaidam Basin. Multiple oil-bearing series were found in Shizigou area and many oil wells with high yield were drilled. In order to further explore the characteristics and distribution rules of lacustrine carbonate reservoir,the data of logging,seismic,core observation and reservoir test analysis,were used to study the geochemical characteristics,structure types,sedimentary characteristics and main controlling factors of sedimentary facies distribution of lacustrine carbonate rocks. The result shows that the lacustrine carbonate rocks in western Qaidam area are composed of mixed sedimentary rocks,and the lithologies are mainly calcitic dolomite and marl,followed by dolomite and limestone. The structural components of carbonate rocks are mainly mud-crystal and crystallite dominate,followed by particles. The sedimentary microfacies are mainly marl flats and calcite dolomite flats,followed by algal banks and oolitic banks. The lithologic assemblage is mainly affected by palaeogeomorphology,paleo-fluid and paleoclimate. Local salinization lacustrine environment,semi-closed salinization lacustrine environment and open salinization lacustrine environment are developed in the study area. The high-quality carbonate reservoirs are formed by the common action of different sedimentary environments and sedimentary models.

Key words: lacustrine carbonate rocks, salinization lacustrine basin, upper member of lower Ganchaigou Formation, Qaidam Basin

CLC Number:

TE122

WANG Jiangong, ZHANG Daowei, YI Dinghong, YUAN jianying, SHI Yajun, MA Xinmin, GAO Yanfang, ZHANG Ping, WANG Peng. Depositional characteristics and facies model of lacustrine carbonate rocks in the upper member of lower Ganchaigou Formation in western Qaidam Basin[J].Lithologic Reservoirs, 2018, 30(4): 1-13.

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Depositional characteristics and facies model of lacustrine carbonate rocks in the upper member of lower Ganchaigou Formation in western Qaidam Basin

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