An resources potential analysis of Wufeng-Longmaxi Formation shale gas in the southwestern margin of Sichuan Basin
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摘要:
为深化认识四川盆地西南缘五峰-龙马溪组页岩储层参数特征及其资源潜力，通过地球化学、矿物组分、物性、扫描电镜、比表面-孔径和等温吸附等研究，测试分析结果表明，富有机质泥页岩（TOC>1%）厚度一般为54~162 m，优质段（TOC>2%）厚度26~70 m，有机碳平均2.99%~3.78%，硅质含量27.96%~37.0%，长石2.87%~4.85%，碳酸盐岩44.2%~54.2%，黏土9.9%~27.80%，具有低硅质、高钙质及普遍含黄铁矿等特点。埋藏环境下页岩孔隙度明显与含气性呈正相关关系，含气性越好，孔隙度越高。主要孔隙类型为有机质孔、黏土矿物晶间孔和黄铁矿晶间孔。孔隙演化可以划分为埋藏阶段有机质孔的形成、气藏破坏阶段有机质孔隙的破坏和表生岩溶3个阶段。Ro为2.38%~3.37%，古地温梯度32.57~37.55℃/km，大地热流值为84.32~97.21 mW/m2，受晚海西期岩浆活动影响，热演化程度、古地温梯度和大地热流值较高相对较高，不同地区差异较大。四川盆地西南缘五峰-龙马溪组页岩沉积相有利、页岩厚度大，各项参数良好，该区五峰-龙马溪组页岩气影响因素为有利岩相组合、较好的保存条件和相对适中的热演化程度（Ro < 3.0%）。该区页岩气勘探应由"正向构造"向"稳定向斜"进行拓展，其中木杆、高桥、永盛、大谷堆等4个稳定向斜区是下一步页岩气勘探与突破的最有利区。
Abstract:Wufeng-Longmaxi Formation in the southwestern margin of Sichuan Basin is an important field of shale gas exploration in the periphery of the Sichuan Basin. In order to study the parameter characteristics of shale reservoir and potential of shale gas resource in Wufeng-Longmaxi Formation and analyze its resource potential, the authors studied the parameters of shale by such means as geochemistry, mineral composition, scanning electron microscope, specific surface-pore diameter, and isothermal adsorption. The thickness of the organic-rich shale (TOC>1%) is generally 54-162 m, the thickness of high quality part (TOC>2%) is 26-70 m. The average organic carbon content is 2.99%-3.78%, the silicon content is 27.96% -37.0%, the feldspar content is 2.87% -4.85%, the carbonate rock content is 44.2%-54.2%, and the clay content is 9.9%-27.80%. It has the characteristics of low silicon content and high carbonate rock content and generally contains pyrite. The porosity of shale in the buried environment has a positive correlation with the gas-bearing property, and the better the gas bearing property, the higher the porosity. The main pore types are organic pore, clay mineral intergranular pore and pyrite intergranular pore. The evolution of the pores could be divided into three stages:the formation of the organic pore at the burial stage, the destruction of the organic pore at the gas reservoir destruction stage and supergene karstification. The Ro is 2.38%-3.37%, the paleogeothermal gradient is 32.57-37.55℃/km, and the terrestrial heat flow value is 84.32-97.21 mW/m2. Influenced by the late Hercinian magmatic activity, the degree of thermal evolution, the paleogeothermal gradient and the terrestrial heat flow value become relatively high, and the differences between different areas could be relatively large. In Wufeng-Longmaxi Formation on the southwestern margin of Sichuan Basin, the shale deposit is favorable, the shale thickness is large, and the parameters of shale are good. The influence factors of shale gas in Longmaxi Group in this area are favorable shale deposit, good preservation condition and relatively moderate degree of thermal evolution (Ro < 3.0%). Therefore, shale gas exploration should be expanded from"structural anticline"to"stable syncline"in such places as Mugan, Gaoqiao, Yongsheng and Da Gudui synclines, where there probably exists great potential of shale gas resource.
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表 1 五峰—龙马溪组富有机质页岩厚度、TOC及Ro统计
Table 1. Statistics of thickness, TOC and Ro of organic-rich shale in the Wufeng-Longmaxi Formation
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表 2 四川盆地西南缘五峰组—龙马溪组页岩矿物组分
Table 2. Mineral composition of the Wufeng-Longmaxi Formation organic-rich shale in southwestern Sichuan Basin
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表 3 四川盆地西南缘五峰—龙马溪组页岩物性统计
Table 3. Reservoir proper statistics of the Wufeng- Longmaxi Formation shale in southwestern Sichuan Basin
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表 4 四川盆地西南缘五峰—龙马溪组页岩气有利区各项参数
Table 4. Various parameters of Wufeng-Longmaxi Formation shale gas favorable area in southwestern Sichuan Basin
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