鹤岗盆地煤层气与致密砂岩气共探潜力评价
Evaluation of Co-exploration Potential of Coalbed Methane and Tight Sandstone Gas in Hegang Basin
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摘要: 针对鹤岗盆地含煤岩系中煤层和致密砂岩层数多、厚度大的特点,从煤岩煤质、沉积环境、储层厚度、封盖特征及含气性等特征进行研究,并结合研究区内鸟山1井的钻孔、气测录井资料,评价了鹤岗盆地煤层气与致密砂岩气(“两气”)的共探潜力。研究结果表明:鹤岗盆地主要厚煤层位于地层层序Ⅱ中(即城子河组上部),沉积体系以河流-上三角洲平原为主,是煤系烃源岩和致密砂岩形成的有利相带;城子河组含煤地层中煤层分布稳定,累计厚度为30~75.99 m,致密砂岩层累计厚度为9~43.03 m,煤层与砂岩层叠置出现,煤层气与致密砂岩气叠置成藏;鸟山1井气测录井结果显示煤层与致密砂岩层均存在全烃异常高值。Abstract: For the characteristics of large number and thickness of coal seams and tight sandstones in the coal-bearing rock series in Hegang Basin, the characteristics of coal rock, sedimentary environment, reservoir thickness, sealing characteristics, and gas-bearing characteristics were studied. Combined with the drilling and gas logging data from Niaoshan well 1 in the study area, the co-exploration potential of coalbed methane and tight sandstone gas(“two gases”) in Hegang basin was evaluated. The results showed that the main thick coal seams in Hegang Basin are located in stratigraphic sequence Ⅱ(that is, the upper part of Chengzihe Formation), and the sedimentary system is dominated by fluvial-upper delta plain, which is a favorable facies zone for the formation of coal measures source rocks and tight sandstone. The distribution of coal seams in the coal-bearing strata of Chengzihe Formation is stable, the cumulative thickness ranges from 30 m to 75.99 m, and the cumulative thickness of tight sandstone strata ranges from 9 m to 43.03 m. Coal seams and sandstone strata overlap and coalbed methane and tight sandstone gas are superimposed to form reservoirs. The results of gas logging in Niaoshan well 1 show that there are abnormal high values of total hydrocarbon in both coal seam and tight sandstone.
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