Exploration and development practice of normal pressure shale gas in Dongsheng structural belt, Nanchuan area, southeast Chongqing
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摘要: 渝东南南川地区东胜构造带位于四川盆地东南缘的盆缘过渡带，经历多期构造改造，具有构造复杂、保存条件复杂、地应力场复杂的典型地质特征，导致常压页岩气单井产量差异较大。为提高东胜复杂构造带常压页岩气单井产量、实现效益开发，通过开展地震资料目标处理、构造特征分析、成藏富集规律研究及生产动态分析等，以及加强基础研究和勘探开发实践，明确了东胜复杂构造带实现常压页岩气效益开发的四项关键技术对策：①提高浅层速度模型精度，提升构造解释准确度；②优化井网部署，提高井控储量；③地质工程一体化，钻定导协同导向提高甜点钻遇率；④建立分区差异化压裂方案，提高裂缝复杂度。东胜常压页岩气效益开发关键技术对策为复杂构造带常压页岩气的效益开发提供了技术支撑，同时也可为盆缘其他类似地区的勘探开发提供借鉴。Abstract: The Dongsheng structural belt in Nanchuan area, southeast Chongqing, is located in the transitional zone of the southeastern margin of Sichuan Basin. It has experienced multi-period tectonic reformation and has typical geological characteristics of complex structure, complex preservation conditions and complex in-situ stress field, which leads to a significant difference in single well production. In order to increase the single well production of normal pressure shale gas wells in Dongsheng complex structural belt and realize profitable development, through target processing of seismic data, analysis of structural characteristics, study of accumulation regularity and analysis of production dynamics, as well as the strengthening of basic research and exploration and development practice, four key technical countermeasures for realizing profitable development of normal pressure shale gas in Dongsheng complex structural belt are defined: (1) improve the accuracy of shallow velocity model and structure interpretation; (2) optimize well pattern deployment, increase well-controlled reserves; (3) integrate geology and engineering, and coordinate drilling, orientation and steering to improve the drilling rate of sweet spots; (4) establish a zonal differentiated fracturing scheme to improve fracture complexity. These four countermea-sures provide technical support for the profitable development of normal pressure shale gas in complex structural zones, and provide reference for the exploration and development of other similar areas along the basin margin.
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图 1 渝东南南川地区构造特征及地质剖面示意
Figure 1. Structural characteristics and geological section of Nanchuan area in southeast Chongqing
图 2 渝东南东胜构造带五峰组底界构造(a)、地层压力系数(b)、最大水平主应力方位变化(c)及最大水平主应力分布(d)
平面位置见图 1。
Figure 2. Bottom boundary structure (a), formation pressure coefficient (b), maximum horizontal principal stress direction change (c) and maximum horizontal principal stress distribution (d) of Wufeng Formation in Dongsheng structural belt, southeast Chongqing
图 3 渝东南东胜与阳春沟构造带施工压力对比
Figure 3. Contrast map of construction pressure of Dongsheng and Yangchungou structural belts in southeast Chongqing
图 4 渝东南东胜构造带过SY23-2HF井轨迹剖面
Figure 4. Trajectory profile of Dongsheng structural belt crossing well SY23-2HF in southeast Chongqing
图 5 渝东南东胜构造带不同加砂强度下裂缝扩展示意
Figure 5. Fracture propagation under different sand strength in Dongsheng structural belt in southeast Chongqing
图 6 渝东南东胜构造带优化开发对策前、后单井EUR(a)与归一化生产曲线对比(b)
Figure 6. Comparison of single well EUR(a) and normalized production curves(b) before and after optimization of development countermeasures in Dongsheng structural belt in southeast Chongqing
图 7 渝东南东胜构造带背斜区与斜坡区气井归一化生产曲线
Figure 7. Normalized production curves of gas wells in the anticline area and slope area of Dongsheng structural belt in southeast Chongqing
表 1 渝东南东胜构造带斜坡区不同加砂强度下缝网模拟参数
Table 1. Simulation parameters of seam mesh under different sand strength in the slope area of Dongsheng structural belt in southeast Chongqing
加砂强度/(m3/m) 平均缝长/m 平均缝宽/m 平均缝高/m 裂缝导流能力/(10-3 μm2·m) EUR预测/108m3 2.0 225 11 31 224 0.65 3.0 286 16 34 427 0.74 4.0 339 19 38 596 0.80 5.0 368 20 40 643 0.82 
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