四川盆地非常规气藏地质-工程一体化压裂实践与认识

doi:10.11743/ogg20220517

Abstract

Abstract:

The concept of engineering integrated with geology originated and prevailing in North America has also been accepted and put into practice during the exploration and development of unconventional oil and gas in the rest of the world. It runs through the whole process that starts with well design， drilling and completion， and ends with fracturing and production， only with focus shifting along the way in adaptation to different geological conditions and exploration or development stages. The introduction of the integrated geology-reservoir engineering approach to fracturing in the Fuling shale gas field in Sichuan Basin has been quite fruitful except for some restrictions frequently felt during exploration activities in some frontier blocks. Due to the diversity and complexity of sedimentary and tectonics in the Sichuan Basin， exploratory/appraisal wells after fracturing are tested with greatly varying results （mostly with low gas flow） even if they are located in the same block or arranged closely to one another. This might be explained by an insufficient accuracy of 3D quantitative characterization and models for key geological engineering parameters such as fractures and in-situ stress in sweet spots， and a lack of adaptive quantitative simulation technologies such as optimal fracturing stage/cluster division， fracture geometry optimization and fracturing process control. This paper systematically summarizes the experiences of an integrated geological-reservoir engineering team gained during fracturing practice in exploratory and appraisal wells for tight gas and shale gas in the Sichuan basin. Their work includes a 3D geo-engineering model of regional unconventional gas reservoirs built with key parameters of geology and engineering such as spatial reservoir distribution， physical properties， gas content， rock mechanics， in-situ stress field， initial formation pressure， mineral contents and natural fractures based on multi-discipline collaboration of geology， well-logging， seismic survey and engineering. Furthermore， the team carried out a fracture propagation simulation based on the model and formed a specific integrative technology series and workflow that could enhance SRV and single well production through tracing and optimization of perforation and diversion parameters， fracturing fluid and proppant volume as well as pumping rate. The implementation of the approach in developing tight gas from the Qianfoya Formation， Puguang Gas field and shale gas from Lintanchang Block in the basin has been proven successful， thus providing a reference for the development of similar unconventional reservoirs.

Key words: 3D geo-engineering model, fracturing optimization, natural fracture, geology-reservoir engineering integration, tight gas, shale gas, Sichuan Basin

CLC Number:

TE357

Guangfu Wang, Fengxia Li, Haibo Wang, Jun Li, Hong Zhang, Tong Zhou, Xiaofei Shang, Linhua Pan, Yunqi Shen. Application of an integrated geology-reservoir engineering approach to fracturing in unconventional gas reservoirs， Sichuan Basin and some insights[J]. Oil & Gas Geology, 2022, 43(5): 1221-1237.

Figures/Tables 15

Fig.1

Fig.2

Table 1

Logging sensitivity factors for identifying fractures in tight sandstone in the Sichuan Basin"

敏感因子	因子形式	作用
电阻率降低因子	$l n ? R d e n v - l n ? R d G R$	识别各类裂缝
声波时差增大因子	$A C - A C e n v 1 - V s h 60$	识别低角度裂缝与裂缝破碎带
电阻率幅度差因子	$l g ? R s e n v / R s - l g ? R d e n v / R d$	识别斜交缝、高角度缝
电阻率分形维度（约束指标）	$∑ i = 1 m l g ? R d i + 1 - l g ? R d i / m$	区分裂缝与孔隙层
声波分形维度（约束指标）	$∑ i = 1 m A C i + 1 - A C i / m$	区分裂缝与孔隙层

Table 1

Fig.3

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Application of an integrated geology-reservoir engineering approach to fracturing in unconventional gas reservoirs， Sichuan Basin and some insights

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