阜新盆地低演化陆相页岩气勘探开发潜力
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摘要
为了进一步推进我国陆相页岩气的勘探开发,在系统总结鄂尔多斯盆地等典型陆相页岩地质特征的基础上,以阜新盆地下白垩统沙海组为例,利用总有机碳含量、岩石比表面积和孔径分布、全岩X射线衍射分析等资料,分析其页岩气储层特征、地球化学特征及可压裂性,并在此基础上与海/陆相页岩气地质特征进行对比,进而对沙海组页岩气储层与页岩气资源潜力进行了评价。研究结果表明:①我国陆相页岩形成时代较晚,总有机碳含量变化范围大,有机质类型以混合型—腐殖型为主,热演化程度低,石英含量低,长石和碳酸盐矿物含量高,总脆性矿物含量与海相页岩相当;②沙海组页岩埋藏深度浅,矿物成分以石英、长石和碳酸盐矿物为主,以介孔为主,孔隙度平均值为3.47%,储集空间类型多样,有利于页岩气的聚集;③沙海组页岩总有机碳含量多大于2%,有机质热演化程度适中,含气量高;④沙海组页岩总脆性矿物含量超过60%,具备良好的可压裂性;⑤沙海组页岩储层分可为3类,其中Ⅰ类储层为页岩气勘探开发目标储层,Ⅱ类储层为有利储层,估算其页岩气资源量介于2 322×108~2 862×108 m3。结论认为,阜新盆地沙海组页岩兼具地质上的页岩气资源潜力与工程上的可压裂性,勘探开发前景较好,在甜点区域具有较大的页岩气商业化开发潜力。
In order to promote the exploration and development of continental shale gas reservoirs in China further, we systematically summarized the geological features of typical continental shale, such as the Ordos Basin. Then, the shale gas reservoir characteristics,geochemical characteristics and fracturing performance of the Lower Cretaceous Shahai Fm in the Fuxin Basin were analyzed by using the data of TOC contents, rock specific surface, pore size distribution and X-ray diffraction analysis of the whole rock. Based on this, it was compared with the marine/continental shale gas reservoirs from the aspect of geological feature. Finally, the shale gas reservoir and resource potential of the Shahai Fm were evaluated. And the following research results were obtained. First, the formation age of China's continental shale is later, its TOC contents vary in a large range, and its organic matters are mainly of a mixed-humic type. And it is characterized by low thermal evolution degree, low quartz content, high feldspar content, high carbonate content, and comparability of total brittle mineral content to marine shale. Second, shale in the Shahai Fm has shallow burial depth and its mineral composition is dominated by quartz, feldspar and carbonate minerals. Its pores are mainly mesopores with an average porosity of 3.47%. There are diverse reservoir spaces, which is favorable for the accumulation of shale gas. Third, the TOC content of the Shahai Fm shale is mainly above 2%, with a moderate thermal evolution degree of organic matter and high gas content. Fourth, the total brittle mineral content of Shahai Fm shale is up to 60%, indicating a good fracturing performance. Fifth, shale reservoirs in the Shahai Fm can be classified into three categories. Type one is target reservoirs of exploration and development, and Type two is favorable reservoirs. It is estimated that the amount of shale gas resources are in the range of 232.2–286.2 billion m3. It is concluded that the Shahai Fm shale in the Fuxin Basin has both resource potential in geology and fracturing performance in engineering, and its exploration and development prospect is broad. What's more, the potential of commercial shale gas development is great in the sweet-point areas.
In order to promote the exploration and development of continental shale gas reservoirs in China further, we systematically summarized the geological features of typical continental shale, such as the Ordos Basin. Then, the shale gas reservoir characteristics,geochemical characteristics and fracturing performance of the Lower Cretaceous Shahai Fm in the Fuxin Basin were analyzed by using the data of TOC contents, rock specific surface, pore size distribution and X-ray diffraction analysis of the whole rock. Based on this, it was compared with the marine/continental shale gas reservoirs from the aspect of geological feature. Finally, the shale gas reservoir and resource potential of the Shahai Fm were evaluated. And the following research results were obtained. First, the formation age of China's continental shale is later, its TOC contents vary in a large range, and its organic matters are mainly of a mixed-humic type. And it is characterized by low thermal evolution degree, low quartz content, high feldspar content, high carbonate content, and comparability of total brittle mineral content to marine shale. Second, shale in the Shahai Fm has shallow burial depth and its mineral composition is dominated by quartz, feldspar and carbonate minerals. Its pores are mainly mesopores with an average porosity of 3.47%. There are diverse reservoir spaces, which is favorable for the accumulation of shale gas. Third, the TOC content of the Shahai Fm shale is mainly above 2%, with a moderate thermal evolution degree of organic matter and high gas content. Fourth, the total brittle mineral content of Shahai Fm shale is up to 60%, indicating a good fracturing performance. Fifth, shale reservoirs in the Shahai Fm can be classified into three categories. Type one is target reservoirs of exploration and development, and Type two is favorable reservoirs. It is estimated that the amount of shale gas resources are in the range of 232.2–286.2 billion m3. It is concluded that the Shahai Fm shale in the Fuxin Basin has both resource potential in geology and fracturing performance in engineering, and its exploration and development prospect is broad. What's more, the potential of commercial shale gas development is great in the sweet-point areas.
引文
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