安塞油田沿河湾区块长8储层特征研究

发布时间：2018-04-22 19:01

本文选题：鄂尔多斯盆地 + 沿河湾区块　；参考：《西北大学》2015年硕士论文

【摘要】：安塞油田沿河湾区块位于陕北地区,其在构造分区属于陕北斜坡中东部。针对安塞沿河湾区块长8储层研究程度低、认识不明确,本次研究以大量前人研究成果为前提,应用储层地质学、石油天然气地质学的学科理论和综合方法,同时采用多样的测试化验方法及数据,对安塞油田沿河湾区块长8储层特征进行了综合研究,最终完成有利区筛选。研究取得了以下重要的结论及认识：(1)沿河湾区块长8为三角洲沉积环境中的三角洲前缘沉积亚相。从长822到长811总体上是一个湖盆逐渐增大的过程,主要发育7-8条主河道,长812与长821河道较宽；其砂体形态呈北东—南西向展布,各小层砂体连通性较好。其中长812及长821砂体厚度及规模较大。(2)储层岩性主要为灰、深灰色细粒岩屑长石砂岩,砂岩分选性好,碎屑颗粒为次棱角状,其中薄膜和孔隙—薄膜为岩石主要胶结类型。沿河湾区块长8储层孔隙类型主要为残余粒间孔、次生溶蚀孔隙长石溶孔和部分少量沸石溶孔。绿泥石胶结强烈,同时碳酸盐胶结物含量偏高。(3)沿河湾区块长8储层机械压实、胶结作用、溶蚀作用较强,研究认为长8储层砂岩的成岩演化主体已进入中成岩阶段A期。(4)通过储层宏观特征和微观特征综合研究,结合各种分析化验和测试结果资料,对沿河湾区块长8储层进行综合分类评价。同时明确沿河湾区块长8油藏主要受岩性、物性控制,为典型岩性油气藏。(5)有效遮挡作用是油气富集成藏的必要条件之一；同时储层微观孔隙结构对储层含油性有着非常重要的作用。根据研究区含油性控制因素,预测研究区长8有利区,其中长812、长821储层较好、优势有利区范围大,其将会是沿河湾区块下一步增储主要的考虑层位。
[Abstract]:Ansai oilfield Yanhewan block is located in northern Shaanxi, which belongs to the central and eastern part of northern Shaanxi slope. In view of the low research level and unclear understanding of Chang 8 reservoir in Ansai Yanhe Bay block, this study is based on a large number of previous research results and applies the theories and comprehensive methods of reservoir geology and petroleum and natural gas geology. At the same time, the characteristics of Chang 8 reservoir in Yanhewan block of Ansai Oilfield were studied comprehensively by using various test methods and data, and the favorable area selection was finally completed. The main conclusions are as follows: (1) Chang8 in the Yanhe Bay block is the delta front sedimentary subfacies in the delta sedimentary environment. From Chang822 to Chang811, there are mainly 7-8 main rivers, 812 and 821 are wide, and the sand bodies are distributed in the NE-SW direction, and the sand bodies in each layer have good connectivity. The results show that the sand bodies in Chang822 and Chang811 are gradually enlarged, and there are 7-8 main rivers, 812 and 821 are relatively wide, and the sand bodies are distributed in the NE-SW direction. The lithology of Chang 812 and Chang 821 sand bodies is mainly ash, dark gray fine grained lithic feldspathic sandstone, good sorting of sandstone and subprism of clastic grains, in which thin film and pore film are the main types of rock cementation. The pore types of Chang 8 reservoir in Yanhewan block are mainly residual intergranular pore secondary dissolution pore feldspar dissolution pore and a small amount of zeolite dissolution pore. At the same time, the content of carbonate cementation is on the high side. 3) Chang 8 reservoir in Yanhewan block is mechanically compacted, cemented and dissolved. It is considered that the diagenetic evolution of sandstone in Chang 8 reservoir has entered the stage A of middle diagenesis. (4) through a comprehensive study of the macroscopic and microscopic characteristics of the reservoir, combined with the data of various analysis, laboratory tests and test results, Comprehensive classification and evaluation of Chang 8 reservoir in Yanhewan block are carried out. At the same time, it is clear that Chang 8 reservoir in Yanhewan block is mainly controlled by lithology and physical property, which is one of the necessary conditions for oil and gas accumulation to be effectively occluded. At the same time, the micro-pore structure of reservoir plays an important role in reservoir oil-bearing. According to the control factors of oil content in the study area, it is predicted that Chang8 favorable area in the study area, in which Chang812 and Chang821 have good reservoir and large advantageous area, will be the main consideration for the further increase of reservoir in Yanhewan block.
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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