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    中扬子地台宜昌地区寒武系水井沱组优质页岩储层发育特征及天然气富集机理研究

    Reservoir characteristics and natural gas accumulation of shales within the Cambrian Shuijingtuo Formation in the Yichang region, middle Yangtze Platform

      摘要
    • 摘要:
      研究目的 湖北省宜昌地区是中扬子地台页岩气勘探的重要前沿领域之一，近年来的野外调查与钻探工作表明该地区的寒武系水井沱组是极具潜在工业价值的页岩气勘探靶区。
      研究方法 本文针对该地区最新的钻孔资料，利用多学科交叉手段，查明该地区水井沱组优质页岩储层的特征以及油气富集规律。
      研究结果 水井沱组页岩有机质丰度高，有机碳含量（TOC）主要分布在0.56%~8.42%，干酪根以II1型和I型为主，Ro等效值分布在2.4%~3.2%。水井沱组页岩储层孔隙度主要分布在0.5%~9.1%，渗透率主要分布在0.019×10−3~0.540×10−3 μm2。水井沱组页岩的储集空间主要包括有机孔隙、无机孔隙以及裂缝等类型。储集空间的发育程度主要与有机质富集程度、黏土矿物含量以及页理缝的发育程度有关。天然气主要以吸附气（45.21%~81.44%）和游离气（18.56%~54.79%）的状态附存于水井沱组页岩储层中，溶解气的比例相对较小。水井沱组页岩储层的含气性主要受有机碳含量、脆性矿物比例以及裂缝发育程度有关。有机碳比例、脆性矿物比例和裂缝发育程度越高，储层含气性越好。
      结论 综合地球化学、岩石物理和现场实测数据，本研究认为宜昌地区水井沱组页岩气极具商业价值，是我国南方理想的页岩气勘探开发目标之一。

       

      Abstract:
      This paper is the result of oil and gas exploration engineering.
      Objective The Yichang area of Hubei Province is one of the important frontier areas of shale gas exploration on the Middle Yangtze platform. Field investigation and drilling works in recent years show that the Cambrian Shuijngtuo Formation in this area is a shale gas exploration target with great potential industrial value.
      Methods Based on the latest borehole data in this area, the characteristics of high−quality shale reservoirs and the hydrocarbon accumulation patterns are identified by means of multidisciplinary methods.
      Results The shale of the Shuijngtuo Formation has high organic matter abundance, with TOC mainly distributed in the range of 0.56%~8.42%. Organic matter is dominated by type II1 and type I kerogen, and Ro equivalent value is distributed in the range of 2.4%~3.2%. Porosity and permeability values of shale reservoirs within the Shuijngtuo formation are mainly in the range of 0.5%~9.1% and 0.019~0.540×10−3 μm2. Reservoir pore spaces of shales within the Shuijngtuo Formation mainly includes organic pores, inorganic pores and fractures. Occurrence of pore spaces is mainly related to the enrichment degree of organic matter, the content of clay minerals and the development degree of fractures. Natural gas is mainly attached to the shale reservoir in the form of adsorbed gas (45.21%~81.44%) and free gas (18.56%~54.79%), and the proportion of dissolved gas is relatively small. The gas bearing property of the shale reservoir is mainly related to the content of organic carbon, the proportion of brittle minerals and the degree of fracture development. The higher the proportion of organic carbon, the proportion of brittle minerals, and the degree of fracture development, the better the gas bearing property of the reservoir becomes.
      Conclusions Based on the geochemical, petrophysical and field measurement data, this study concluded that the shale gas of the Shuijingtuo Formation in Yichang area has great commercial value and is one of the ideal targets for shale gas exploration and development in southern China.

       

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