柴达木盆地柴西地区古近系—新近系致密油勘探潜力分析

doi:10.3969/j.issn.1673-8926.2015.03.004

Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 26-31.doi: 10.3969/j.issn.1673-8926.2015.03.004

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Exploration potential of tight oil of the Paleogene and Neogene in western Qaidam Basin

WAN Chuanzhi¹， WANG Peng²， XUE Jianqin²， SU Xueying³， ZHOU Gang²， GOU Yingchun¹

1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest ， Lanzhou 730020 ， China ； 2. Research Institute of Exploration and Development ， PetroChina Qinghai Oilfield Company ， Dunhuang 736202 ， Gansu ， China ；3. College of Geosciences ， China University of Petroleum （ Beijing ）， Beijing 102200 ， China

Online:2015-05-26 Published:2015-05-26

Abstract

Abstract:

The Paleogene Lower Ganchaigou Formation and Neogene Upper Ganchaigou Formation in the western Qaidam Basin have the basic geological conditions to form tight oil. The organic carbon content of effective hydrocarbon source rocks in the upper segment of Lower Ganchaigou Formation is between 0.8% and 2.0%, and the type of organic matter is mainly Ⅰ-Ⅱ₁. The organic carbon content of effective hydrocarbon source rocks in Upper Ganchaigou Formation is between 0.6% and 1.5%, and the type of organic matter is mainly Ⅰ-Ⅱ₁. Thermal simulation experiment shows that it is in the main stage of hydrocarbon generation of Paleogene-Neogene in western Qaidam Basin when the R_oof source rocks is between 0.47% and 1.30%, and liquid hydrocarbon yield reaches maximum when R_ois 0.746%. Sedimentary facies study indicates that extensively developed semi deep-deep lake facies source rocks of the Paleogene Lower Ganchaigou Formation and Neogene Upper Ganchaigou Formation has source-reservoir symbiotic relation with shore shallow lake facies sand bodies or carbonate rocks, which is beneficial to form tight oil, and ramp area of paleostructure and the center of source sag are favorable for tight oil enrichment. The Neogene Upper Ganchaigou Formation in Zhahaquan Sag-Wunan ramp area, Upper Ganchaigou Formation and Lower Youshashan Formation in NanyishanXiaoliangshanarea and the upper segment of Lower Ganchaigou Formation in Qigequan-Yuejin ramp area are the three favorable exploration zones for tight oil.

Key words: tight oil, resources potential, Paleogene, Neogene, western Qaidam Basin

WAN Chuanzhi, WANG Peng, XUE Jianqin, SU Xueying, ZHOU Gang, GOU Yingchun. Exploration potential of tight oil of the Paleogene and Neogene in western Qaidam Basin[J].Lithologic Reservoirs, 2015, 27(3): 26-31.

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