江陵凹陷新沟嘴组新下1沉积体系研究

发布时间：2018-04-28 01:57

本文选题：江陵凹陷 + 沉积体系　；参考：《长江大学》2015年硕士论文

【摘要】：江陵凹陷位于江汉盆地西南部。东邻丫角-新沟低凸起,北以纪山寺断层与河溶凹陷、远安凹陷、荆门地堑相隔,南部东段超覆在华容隆起之上,西段与湖南洞庭盆地相通,西部北段以问安寺断层为界与枝江凹陷相邻,南段超复在中古生界宜都-鹤峰背斜带和桑植-石门复向斜之上,是江汉盆地最大的白垩-古近系沉积凹陷,面积达6500km2。目前,江陵凹陷勘探程度较低,资源量发现率低,具有巨大的勘探潜力；同时,江陵凹陷新沟嘴组又是一个碎屑与蒸发混合沉积的凹陷,油、盐共生；荆州背斜带油气发现丰富,随着开发的深入,原有的沉积微相的认识与砂体连通性的认识不能满足生产的需要,因此在落实前人沉积体系展布研究成果上,深化荆州背斜带沉积微相及砂体连通性的认识,为下一步滚动开发提供依据。本文通过岩心录井资料,通过岩心观察与描述,查明岩电关系,完成岩心相分析；查明从碎屑沉积到化学沉积的沉积相类型,建立测井相模式；利用测井相分析成果,通过测井相标定,完成沉积相展布分析。通过相控,查明砂岩的展布,预测有利的岩性圈闭。主要得出以下结论。1、江陵凹陷砂岩粒度较细,以粉砂为主,细砂次之,中粗砂不发育,不见砾。平均粒度曲线呈S形说明碎屑粒度分布特征总体上为三角洲前缘河口沙坝之后到前三角洲之间的分流河道沉积类型。2、在测井相分析的基础上,三角洲平原亚相主要发育分流河道、天然堤、决口扇微相。分流河道呈钟型曲线或箱型+钟型曲线特征,天然堤位于分流河道顶部,岩性为泥质粉砂岩,曲钟型曲线特征。决口扇微相位于三角洲平原亚相,呈漏斗型曲线特征。综合暗色泥岩分布,蒸发岩分布,完成研究区小层沉积相图7幅；认为荆州北斜带荆西油田以西,处于南荆水系分流河道前缘；八岭油田及以东地区,处于远安水系三角洲前缘分流河道区。3、在前人成果综述的基础上,通过重矿物分析、结合砂岩岩性、粒度分析,证实江陵凹陷新下段只发育北部远安水系和南荆水系两个物源体系,远安水系分布于八岭油田及以西地区,南荆水系分布于花园油田、荆西油田及以东地区；发育于凹陷北部地区。4、通过岩心观察,在岩心相图和测井资料分析的基础上,结合粒度资料,总结出研究区的主要沉积微相类型包括三角洲前缘分流河道,支流间湾；浅湖砂坝,浅湖泥；盐湖等六类微相类型。5、江陵凹陷沉积体系总的特征有3方面：①北砂南膏泥、中部为暗色泥岩与盐岩沉积区。②北砂受两个水系控制,东为南荆水系,西为远安水系。③梅槐桥洼陷处于远安水系前缘,资福寺洼陷处于南荆水系前缘。主要发育河流三角洲沉积体系和湖盆蒸发岩体系两类沉积体系。6、在砂岩分布图,构造图、测井解释成果图、试油成果图迭合的基础上,进行了岩性圈闭分析与评价,进行有利区迭合,根据迭合程度高低,选取迭合层数在多层的有利区,共选出2个最有利区。
[Abstract]:The Jiangling sag is located in the southwest of the Jianghan Basin. The east adjacent Ya Jiao - Xin Gou low uplift, the north of the Ji Shansi fault and the river dissolve depression, the Jingmen graben, the South East section overlying the Huarong uplift, the west section of the Hunan Dongting Basin, the border of the Q 'an temple adjacent to the Zhijiang sag, and the southern section over the Middle Paleozoic. The Yidu Hefeng anticline belt and the Sangzhi Shimen complex syncline are the largest Cretaceous Paleogene sedimentary sags in the Jianghan Basin. The area reaches 6500km2. at present, the exploration degree of Jiangling sag is low, the discovery rate of resources is low, and it has great exploration potential. At the same time, the Xin Gou mouth formation in Jiangling depression is also a depressions of detrital and evaporative mixed deposits, oil, The Jingzhou anticline belt is rich in oil and gas discovery. As the development deepens, the understanding of the original sedimentary microfacies and the understanding of the connectedness of the sand body can not meet the needs of the production. Therefore, the understanding of the sedimentary microfacies and the sand body connectivity of the Jingzhou anticline zone is deepened in the implementation of the previous research results of the predecessors' depositional system, providing the next rolling development. According to the data of core logging, through the observation and description of core, the relationship between rock and electricity is found out, the core phase analysis is completed, the types of sedimentary facies from clastic deposition to chemical deposition, the model of logging facies are established, and the results of logging facies analysis are used to determine the distribution of sedimentary facies through well logging, and the sandstone expansion is identified by phase control. The main conclusions are as follows:.1, the grain size of the sandstones in Jiangling depression is fine, mainly with silt and fine sand, the coarse sand is not developed, and the gravel is not developed. The average grain size curve shows S shape distribution characteristics of the debris granularity distribution, which is the distributary channel sedimentary type.2 between the delta front estuary sand dam and the former Delta. On the basis of log facies analysis, the subfacies of delta plain mainly develop distributary channel, natural dike and crevasse fan microfacies. The distributary channel is characterized by bell type curve or box type + bell type curve, the natural dike is located at the top of the distributary channel, the lithology is muddy siltstone, and the curve of the curved bell type curve is located in the delta plain subfacies and is funnel-shaped. The distribution of dark mudstone, the distribution of the evaporite and the distribution of the evaporite, completed the sedimentary facies map of the small layer of the study area 7. It is believed that the west of Jingxi oilfield in the north of Jingzhou is in the front of the distributary channel of the South jingling water system, and the eight ridge oil field and the East region are in the delta front distributary channel region.3 of the far safe water system, and on the basis of the previous achievements, the heavy minerals are passed through the heavy minerals. Based on the analysis of sandstone lithology and particle size analysis, it is proved that the new lower section of Jiangling sag developed only two source systems in the northern far and South Jing water system. The remote safety water system is distributed in the eight ridge and west areas. The South Jing water system is distributed in the garden Oilfield, Jingxi oilfield and the east area; it is bred in the northern area of the depression.4, through the core observation, the core is in the core. On the basis of the analysis of phase map and log data, the main sedimentary microfacies of the study area include delta front distributary channel, inter tributary Bay, shallow lake sand dam, shallow lake mud, Saline Lake and other six types of microfacies.5, and there are 3 aspects of the total characteristics of the Jiangling sag system: (1) the North Sand paste mud and the dark mudstone in the middle. The northern sand is controlled by two water systems, the East is the South Jing water system, and the west is the far safe water system. (3) the Meishan depression is in the front of the far safe water system, and the fufu Temple depression is in the front of the southern watery water system. The main development of the sedimentary system of the River Delta and the sedimentary system of the lake basin evaporite system,.6, is explained in sandstone distribution map, structure map and log. On the basis of the overlap of the oil test results, the lithologic traps are analyzed and evaluated, and the favorable areas overlap. According to the degree of overlap, the number of overlapping layers is selected in the multi-layer favorable areas, and 2 most favorable areas are selected.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】