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《China Petrleum Exploration》 2004-05
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Tertiary Lake Algal Limestone Oil and Gas Reservoirs in Western Part of Qaidam Basin and Exploration Potential

Chen Ziliao, Shou Jianfeng, Wang Shaoyi, Meng Shaoxing//Hangzhou Geological Research Institute of PetroChina Exploration and Development Research Institute, Hangzhou City, Zhejiang Province, 310023  
Distributed in extensive areas, Tertiary algal limestone reservoirs in Qaidam Basin are the most important oil and gas reservoirs in the Tertiary carbonate rock reservoirs in the basin. Currently, Tertiary algal limestone reservoirs found in Qaidam Basin are located mainly in the western part of the basin, such as Yaoxi, Yaodong, Qigequan, Shizigou, Huatugou, Jiandingshan, Nanyishan and Dafengshan. They are distributed from the upper section of Lower Ganchaigou Formation (E3 ) to Upper Youshashan Formation (N2 ). The algal limestone of E3 and N1 is distributed mainly in the west of 2 2 2 Yingxiongling Depression. The algal limestone of N2 and N2 is distributed mainly in the east of Yingxiongling Depression. This is closely related to 1 2 invasion and recession of lake water, migration sedimentary center and basin development in Qaidam Basin. There are mainly two diagenetic types for Tertiary lake algal limestone reservoirs in the western region of Qaidam Basin – algal ?at limestone of shore subfacies and algal dome limestone of shallow lake subfacies. They are completely different from one another in sedimentary characteristics, rock type and reservoir characteristics. The space of algal ?at limestone reservoir of shore subfacies is mainly the secondary dissolved pores and dissolved seams, which are formed in relation to ?ltration of atmospheric fresh water. The space of algal dome limestone reservoirs of shallow lake subfacies is mainly the secondary dissolved pores and dissolved seams, with evolution of original calcareous green algal pipe-shape pores at the same time. The dissolved pores and seams are formed in relation to solution of atmospheric fresh water and solution of organic acid along the fault zone in later periods. Tertiary System in the western region of Qaidam Basin is the key exploration target area of Qinghai Oil Field in the recent years, where the oil and gas exploration has a great potential. The algal limestone found in the recent years is one of the exploration targets worthy of attention. The algal limestone reservoirs in the identi?ed areas are good for their properties and commercial oil and gas ?ow has been acquired from the reservoirs. It is the new exploration target layer in the western region of Qaidam Basin and hopeful to be expanded in the exploration scope, becoming an important exploration ?eld in the region.
【CateGory Index】: P618.13
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