Reservoir Characteristicsand Significance of Tertiary Lacustrain Reef in Western Qaidam

GUOZe-qing; ZHONGJian-hua; LIUWei-hong; WENZhi-feng; LIU Zu-han; WANG Hai-qiao

In the western Qaidam basin, Tertiary lacustrine reef has been discovered recently in several kilometers strata from the lower member of lower Ganchaigou formation to lower Youshashan formation in Ganchaigou area. On the basis of numerous observations on outcrop, thin sections and casting sections of the reef, and the application of various analytical techniques including analysis of capillary pressure curve and pattern analysis of pore structure, reservoir characteristics of reef have been thoroughly studied. The reef has complex types of pores, such as skeletal pores, intraparticle pores, moldic pores and corroded cavities, and so on. The reef underwent four diagenetic period, such as syngenetic, eogenetic, telogenetic, and hypergene diagenetic period. The formation of the pores are mainly affected by the cementation and dissolution with few primary pores, however, the secondary pores are abundant and form excellent reservoir for oil and gas. The discovery of the Tertiary lacustrine reef in the Qaidam Basin is of important practical significance for the exploration and development of the Qinghai oilfield.

1. Langfang Branch, Research Institute of Petroleum Exploration and Development, CNPC, Langfang Hebei 065007;

2. Earth Resource and Information College of University of Petroleum (East China), Dongying Shandong 257061;

3. Guanzhou Geochemistry Institute, Chinese Academy of Sciences, Guanzhou 510640;

4. Xiangtan Industry college, Xiangtan Hunan 411201

Received Date: 2003-09-09

Rev Recd Date: 2003-11-19

Publish Date: 2004-09-10

Key words:

Abstract: In the western Qaidam basin, Tertiary lacustrine reef has been discovered recently in several kilometers strata from the lower member of lower Ganchaigou formation to lower Youshashan formation in Ganchaigou area. On the basis of numerous observations on outcrop, thin sections and casting sections of the reef, and the application of various analytical techniques including analysis of capillary pressure curve and pattern analysis of pore structure, reservoir characteristics of reef have been thoroughly studied. The reef has complex types of pores, such as skeletal pores, intraparticle pores, moldic pores and corroded cavities, and so on. The reef underwent four diagenetic period, such as syngenetic, eogenetic, telogenetic, and hypergene diagenetic period. The formation of the pores are mainly affected by the cementation and dissolution with few primary pores, however, the secondary pores are abundant and form excellent reservoir for oil and gas. The discovery of the Tertiary lacustrine reef in the Qaidam Basin is of important practical significance for the exploration and development of the Qinghai oilfield.

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Reservoir Characteristicsand Significance of Tertiary Lacustrain Reef in Western Qaidam

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