鄂尔多斯盆地北部十里加汗区带致密砂岩储层流体赋存状态及分布特征

发布时间：2018-11-25 13:13

【摘要】：鄂尔多斯盆地北部十里加汗区带上古生界高产气层与低产气层、(含气)水层共存分布,目前对其气水分布的特征、规律及影响因素认识不清,制约了该区天然气勘探开发的进程。为此,统计分析了该区上古生界地层水的矿化度、pH值及离子含量等数据,发现该区地层水水型基本为CaCl_2型;进而利用钻井岩心、录井、测井及分析测试等资料,结合地层水地球化学特征分类评价结果,厘清了地层水的成因、类型、控制因素和空间分布特征,并建立了该区气层、水层和干层的测井识别图版,明确了储层流体的赋存状态与分布规律。结论认为:1 CaCl_2型地层水指示该区地层封闭性好,有利于天然气聚集成藏;2该区储层流体存在自由水、毛细管水和束缚水3种赋存状态,自由水主要分布在区带西部,束缚水主要分布在区带东部,而毛细管水则在全区普遍存在;3将所建立的测井识别图版在该区锦86等井进行了应用,识别结果与试气结果基本一致,表明该识别图版能够有效识别气水层。
[Abstract]:The upper Paleozoic high-yielding gas layer and low-yielding gas layer and (gas-bearing) water layer coexist in the Shilijiahan area of northern Ordos Basin. At present, the characteristics, regularity and influencing factors of gas-water distribution are not well understood. The process of natural gas exploration and development in this area is restricted. Therefore, the data of salinity, pH value and ion content of the Upper Paleozoic formation water in this area are statistically analyzed. It is found that the formation water type in this area is basically CaCl_2 type. Based on the data of drilling core, logging, logging and analysis and testing, combined with the classification and evaluation results of geochemical characteristics of formation water, the origin, type, control factors and spatial distribution characteristics of formation water are clarified, and the gas reservoir in this area is established. The pattern of logging identification of water and dry layers makes clear the occurrence and distribution of reservoir fluid. The conclusions are as follows: (1) CaCl_2 type formation water indicates good stratigraphic sealing in this area, which is favorable for natural gas accumulation to form reservoir; (2) there are free water, capillary water and bound water, free water mainly distributes in the western part of the zone, bound water mainly distributes in the eastern part of the zone, and capillary water exists generally in the whole area; (3) the established log recognition pattern has been applied in Jin86 and other wells in this area, and the result of identification is basically consistent with that of gas test, which indicates that the recognition plate can effectively identify gas and water layers.
【作者单位】：长江大学;中石化华北石油工程有限公司测井分公司;中国石化华北油气分公司勘探开发研究院;河南省地矿局第二地质矿产调查院;
【基金】：国家科技重大专项课题“碎屑岩层系大中型油气田富集规律与勘探关键技术”(编号:2011ZX05002-001-002)
【分类号】：P618.13

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