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    中国百强科技报刊

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    Volume 48 Issue 1
    Jan.  2023
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    Article Navigation >  Earth Science  > 2023  >  48(1): 252-266
    Yu Kai, Xian Chenggang, Wen Heng, Huang Xiaoqing, He Yong, Wang Jianjun, Shen Yinghao, Yan Xi, Ma Yuanhong, Cao Wei, 2023. Stereoscopic Development Exploration of Shallow Shale Gas in Zhaotong National Shale Gas Demonstration Area: Case Study of YS203H1 Pad of Haiba Anticline Southern Limb. Earth Science, 48(1): 252-266. doi: 10.3799/dqkx.2022.137
    Citation: Yu Kai, Xian Chenggang, Wen Heng, Huang Xiaoqing, He Yong, Wang Jianjun, Shen Yinghao, Yan Xi, Ma Yuanhong, Cao Wei, 2023. Stereoscopic Development Exploration of Shallow Shale Gas in Zhaotong National Shale Gas Demonstration Area: Case Study of YS203H1 Pad of Haiba Anticline Southern Limb. Earth Science, 48(1): 252-266. doi: 10.3799/dqkx.2022.137
    shu

    Stereoscopic Development Exploration of Shallow Shale Gas in Zhaotong National Shale Gas Demonstration Area: Case Study of YS203H1 Pad of Haiba Anticline Southern Limb

    doi: 10.3799/dqkx.2022.137
    • 1.

      State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

    • 2.

      Schlumberger (China), Beijing 100015, China

    • 3.

      PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China

    • Received Date: 2022-01-30
      Available Online: 2023-02-01
    • Publish Date: 2023-01-25
      Abstract
    • The shallow shale gas in the Zhaotong area has a wide distribution and large geological reserves, with a large development potential. To realize the efficient production and resource utilization of shallow shale gas in the Haiba backslope of the central area, based on the experience of the Taiyang backslope, the feasibility of the stereoscopic development of shallow shale gas in Haiba and the deployment of the well pattern were explored, based on the geology-engineering integration concept and research workflow. The research result shows that the best target for single-layer development is still the Long 111 layer, and the Wufeng Formation does not have the conditions for economic development as an independent development layer system under the current process technology and economic index, and further exploration is still needed. The thickness of Class Ⅰ+Ⅱ high quality reservoir between Long 111 layer + Long 113 layer is large, compared with the development of Long 111 single layer, using Long 111 minor layer + Long 113 layer with stereoscopic staggered well pattern in the same well spacing and number of wells, the platform EUR and IRR are greatly increased. Under the same control area conditions, there is an optimal interval between well spacing and well number, and 250 m is recommended as the best well spacing under the current technology and economic index; if the well construction cost decreases, there is a potential to further reduce the well spacing and improve the overall EUR of the platform. Large-scale hydraulic fracturing will not only change the in-situ stress magnitude, but also change the horizontal principal stress direction, thus changing the stress state in the near-well zone from a walking-slip to a reverse-fault state, and adversely affecting the hydraulic fracturing due to T shape fracture. One-time well deployment can effectively reduce negative inter-well stress interference and improve the degree of inter-well reserve utilization compared to the infill well pattern deployment. In conclusion, the development of shallow shale gas in Haiba is suitable to adopt a stereoscopic staggered one-time well pattern with small well spacing, promoting the development of Zhaotong area shallow shale gas in a cost-effective way.

       

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