延长东区上古生界山西组气层识别与综合评价

发布时间：2018-08-11 19:38

【摘要】：延长东区上古生界山西组分布范围广,储层发育,试气试采结果显示较高的产气量,为上古生界主力产气层段。为了对山西组天然气资源量进行准确评估,必须清楚认知气层。本文密切结合气田勘探开发实践,以录井、测井、实验分析及试气试采等成果为依据,以山西组气层为对象,以“四性关系”研究为关键,在综合地质研究基础上,对气层成因机理进行深入研究,并探讨了气层识别评价的方法和标准。研究结果表明,山西组为三角洲前缘亚相沉积,气层主要发育在水下分流河道与河口坝砂体中。因成岩作用强烈多期,致使气层表现形式多样,形成机理复杂,既有常规高阻气层,又有“低阻”气,确定区内“低阻”上限为40?·m。常规高阻气层主要受生、储、盖组合的控制,而岩性细粒、孔隙结构复杂、高矿化度水及高束缚水含量造就了“低阻”气层的形成。采用测井曲线重叠法、交会图法及阵列感应测井对气层进行定性识别,建立测井解释模型进行定量识别,并建立综合识别评价气层的一套标准,结合试气试采结果进行验证,从而提高了气层识别的准确度。
[Abstract]:The Shanxi formation of Upper Paleozoic in Yanchang District has a wide distribution range and developed reservoir. The result of gas test and production test shows that the gas production rate is higher, which is the main gas producing zone of Upper Paleozoic. In order to accurately evaluate the natural gas resources of Shanxi formation, it is necessary to recognize the gas formation clearly. In this paper, based on the results of logging, experimental analysis and gas test and production, taking the gas formation of Shanxi formation as the object and taking the study of "four-sex relationship" as the key point, and on the basis of comprehensive geological research, this paper closely combines the exploration and development practice of gas fields. The formation mechanism of gas reservoir is deeply studied, and the methods and standards of gas reservoir identification and evaluation are discussed. The results show that Shanxi formation is delta front subfacies and gas layer is mainly developed in underwater distributary channel and estuarine bar sand body. As a result of strong diagenesis for many periods, the gas layer is characterized by various forms and complex formation mechanism. The upper limit of "low resistivity" in this area is determined to be 40? mm, which includes both conventional high resistivity gas formation and "low resistivity" gas. Conventional high resistivity gas reservoirs are mainly controlled by assemblages of generation, reservoir and cap, while the formation of "low resistivity" gas reservoirs is caused by the lithologic fine grains, complex pore structure, high salinity water and high bound water content. The method of log curve overlap, cross plot and array induction logging are used to identify gas reservoir qualitatively, and a logging interpretation model is established for quantitative identification, and a set of criteria for comprehensive identification and evaluation of gas reservoir are established, which are verified by test gas production test results. Thus, the accuracy of gas reservoir identification is improved.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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