Title: Comprehensive evaluation of geology and engineering integration of XTT tight oil reservoir

Authors: Xiu Li; Chengwen Liu; Tengwen Luo; Bingquan Ai; Aifeng Li; Luyao Gao; Shenglun Zhou

Addresses: Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China ' Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China ' Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China ' Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China ' Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China ' Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China ' Jingbian Oil Production Plant, Yanchang Oilfield Co. Ltd., Jingbian Shaanxi 718500, China

Abstract: The XTT Development Zone C7 offers promising exploration and evaluation potential. However, challenges arise due to factors such as strong heterogeneity, thin sand layers, and unstable distribution. These issues make it hard to identify the best drilling locations, often termed as 'sweet spots', especially in horizontal well deployment. This study uses both indoor experiments and field logging data. By building upon previous research, we: 1) calculated the rock's mechanical parameters; 2) created a model for petrophysical parameters; 3) established an in-situ stress model. From this data, we proposed a method to evaluate the sweet spots. This method combines both geological and engineering perspectives. Using this approach, we devised a sweet spot index specifically for the C7 region. Consequently, the XTT reservoir was categorised into three types to guide drilling operations. Our results indicate that type I and type II reservoirs are most suitable for development. The practical results from drilling and development validate our methodology's effectiveness. This research lays a foundation for deciding future drilling locations and optimising reservoir development. [Received: June 22, 2023; Accepted: October 15, 2023]

Keywords: tight oil; rock mechanical parameters; geology-engineering integration; sweet spot.

DOI: 10.1504/IJOGCT.2024.138691

International Journal of Oil, Gas and Coal Technology, 2024 Vol.35 No.4, pp.347 - 365

Received: 19 Jun 2023
Accepted: 15 Oct 2023
Published online: 24 May 2024 *

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