Strategic breakthrough and prospect of Qiulitag structural belt in Kuqa depression

doi:10.3969/j.issn.1672-7703.2019.01.003

Abstract

Abstract: In the Qiulitag structural belt, one of the important oil and gas exploration zones in Kuqa depression of the Tarim Basin, early exploration discovered the large Dina 2 condensate gas field, the Chaule 1 reservoir and the Dongqiu 8 shallow reservoir on the east and west sides. Since then, no gas reservoir has been found for 16 years. In the Qiulitag structural belt, the surface condition is difficult with blade-like ridges here and there, and the underground composite salt layer is strongly deformed. Resulting in poor 2D seismic data, it's difficult to accurately identify the structure. In this study, by focusing on the task to break through exploration technology bottleneck in "identifying traps", and strengthening the regional geological research, structural segments were described, especially the Zhongqiu segment of the Qiulitag structural belt; by improving 2D wide-line seismic acquisition and processing, traps were found in batches, and the breakthrough was located; by scientific decision-making, and advanced deployment of Dongqiu 8 mountain 3D seismic survey, the subsalt Zhongqiu 1 structural trap was identified and an exploration well, Zhongqiu 1, was drilled. High-yield industrial oil/gas flow was obtained from the Cretaceous Bashijiqik Formation, proving a strategic breakthrough and indicating a bright future in oil and gas exploration in the Qiulitag structural belt.

Key words: Tarim Basin, Kuqa depression, Qiulitag structural belt, strategic breakthrough, prospect

CLC Number:

Du Jinhu, Tian Jun, Li Guoxin, Yang Haijun, Zhang Yijie, Li Yong, Xu Zhenping, Luo Haoyu. Strategic breakthrough and prospect of Qiulitag structural belt in Kuqa depression[J]. China Petroleum Exploration, 2019, 24(1): 16-23.

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