安塞油田桥19井区长3油层组沉积相与油气聚集规律研究

发布时间：2018-10-09 17:03

【摘要】：鄂尔多斯盆地是一个多旋回叠合型盆地,是我国陆上的第二大沉积盆地,油气资源丰富,油气勘探与开发的潜力很大。它已经成为我国未来油气勘探与开发的最重要的战略地区之一,其油气资源的探明与开发直接影响着我国石油工业的发展。安塞油田作为鄂尔多斯盆地的一个主要产油区,三叠系延长组长3油层组为鄂尔多斯盆地安塞地区的主要含油层系,其油气资源的勘探开发有很重要的意义,为了进一步地研究该区油气聚集的规律,有必要对安塞油田桥19井区长3油层组的沉积相及油气聚集规律做细致的研究。本文以沉积相与石油地质理论为基础:采用野外地质调查与室内地质研究相结合,综合地质背景、岩性组合、沉积构造、沉积结构、地球化学、储层物性、试油气及有机质化学分析等资料,研究了安塞油田桥19井区长3油层组沉积微相的发育特征、地层及砂体的展布特征,在此基础上,研究影响其油气富集的因素。利用研究区主要标志层,结合沉积旋回和地层等厚等原则,按传统划分方案,将研究区长3油层组划分为311、长312、长32、长33四个小层,系统确定了各个小层之间的分层界线,详细地描述了各层的岩电特征,为研究区的沉积相及油气富集规律的研究奠定了良好的基础。通过对砂体的平面展布形态、地层的岩电特征、砂泥比、沉积构造类型、单井的沉积相剖面及粒度分析等研究表明,安塞油田长3储层为三角洲平原亚相沉积,其沉积微相有:分流河道、河道侧翼和分流间湾。在沉积微相研究的基础上,分析了安塞油田长3储层油气富集规律。研究认为:河道砂体是油气富集的主要区带;局部隆起构造与上倾方向的岩性遮挡条件是油气聚集的保证,隆起幅度越大,遮挡条件越好,油气富集程度越高;油源对长3油气的富集有一定的影响,但还需进一步探讨。在上述研究的基础上,分析构造、沉积和成岩作用与生储盖和油气分布规律的关系,结合各层油藏控制因素和分布规律,通过划分流动单元与试油试采数据相结合,确定成藏有利区。
[Abstract]:The Ordos Basin is a polycyclic superimposed basin and the second largest sedimentary basin on land in China with abundant oil and gas resources and great potential for oil and gas exploration and development. It has become one of the most important strategic areas for oil and gas exploration and development in the future in China, and the exploration and development of its oil and gas resources directly affect the development of China's petroleum industry. Ansai Oilfield is one of the main oil producing areas in Ordos Basin, and the third formation of Yanchang formation of Triassic is the main oil-bearing strata in Ansai area of Ordos Basin. The exploration and development of its oil and gas resources is of great significance. In order to further study the regularity of oil and gas accumulation in this area, it is necessary to study the sedimentary facies and hydrocarbon accumulation law of Chang3 reservoir formation in Qiao19 area of Ansai Oilfield. This paper is based on sedimentary facies and petroleum geology theory: combining field geological survey with indoor geological research, comprehensive geological background, lithologic combination, sedimentary structure, geochemistry, reservoir physical property, The development characteristics of sedimentary microfacies, distribution characteristics of strata and sand bodies in Chang 3 reservoir formation of well Qiao19 in Ansai Oilfield are studied. On the basis of these data, the factors influencing the accumulation of oil and gas are studied. Based on the principle of sedimentary cycle and formation equal thickness, the Chang 3 oil layer formation in the study area is divided into four sub-layers, namely, 311, 312, Chang32 and 33, according to the traditional division scheme. The stratification boundary between each sub-layer is determined systematically. The characteristics of rock and electricity in each layer are described in detail, which lays a good foundation for the study of sedimentary facies and oil and gas enrichment law in the study area. Through the study of the flat distribution morphology of sand body, the lithoelectric characteristics of formation, the ratio of sand to mud, the type of sedimentary structure, the sedimentary facies profile of single well and the grain size analysis, it is shown that Chang 3 reservoir in Ansai oilfield is delta plain subfacies deposit. The sedimentary microfacies include distributary channel, flanking channel and interdistributary bay. Based on the study of sedimentary microfacies, the oil and gas enrichment law of Chang 3 reservoir in Ansai Oilfield is analyzed. The study shows that the channel sand body is the main zone of oil and gas enrichment, the lithologic occlusion condition of local uplift structure and updip direction is the guarantee of oil and gas accumulation, the bigger the uplift amplitude is, the better the occlusion condition is, and the higher the oil and gas enrichment degree is. Oil source has a certain influence on the accumulation of Chang3 oil and gas, but it needs to be further discussed. On the basis of the above research, the relationship between structure, sedimentation and diagenesis and the distribution of source, reservoir, cap and oil and gas is analyzed. Combined with the control factors and distribution law of reservoir in each layer, the flow unit is divided into production test and production test data. Determine favorable areas for reservoir formation.
【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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