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Oil and Gas Accumulation Conditions of Eboliang Structural Belt on Northern Periphery of Qaidam Basin and Exploration Strategy

Sun Ping1, Wang Liqun2, Guo Zeqing1, Tian Jixian1, Zhang Lin1, Zeng Xu1, Zhang Shaosheng1   

  1. PetroChina Research Institute of Petroleum Exploration & Development,Langfang Branch; Exploration & Development Research Institute of PetroChina Qinghai Oilfield Company
  • Online:2014-08-15 Published:2014-08-15

Abstract: Eboliang structural belt on the northern periphery of Qaidam Basin is composed of four surface structures – Eboliang No.Ⅰ, Eboliang No. Ⅱ , Eboliang No. Ⅲ and Hulushan. The latest study and re-investigation of old wells indicate that this belt has good conditions for natural gas accumulations, because it is located in the Jurassic gas sourcing depression with development of large-scale structural traps, high-quality reservoir-cap assemblages and the deep and large faults that connect gas sources. There are two patterns for gas accumulations – within the source and above the source. Significant breakthroughs have been made in the nearby Niudong structure in recent time. Gas show was found in drilling of other structures. In addition, E-7 Well obtained an industrial gas flow. Based the accumulation conditions and analysis of the current exploration conditions, this paper proposes to drill exploration wells first in Eboliang No.Ⅰ structure in this belt while making active preparations for other structures. Meanwhile, the detailed seismic exploration efforts should be focused on Eboliang No. Ⅲ structure to locate the trap for exploration.