成都凹陷蓬三段沉积特征研究

发布时间：2018-06-20 10:55

本文选题：成都凹陷 + 蓬三段　；参考：《长江大学》2015年硕士论文

【摘要】：成都凹陷位于川西坳陷中段,先后受到了印支、燕山以及喜山期等多期构造运动,在凹陷内部形成了一些有利于油气聚集的古构造,这些正向构造及斜坡成为有利的油气运移指向带,同时蓬莱镇组气藏历来是川西坳陷目前的主力气藏资源量丰富,勘探潜力巨大,所以成都凹陷蓬三段成为潜在的勘探潜力区。论文在前人研究的结果上通过野外露头、岩心资料并与测井相、地震相结合总结出了层序识别标志以及各级次基准旋回特征,进行单井层序划分并结合前人建立的川西坳陷中段蓬莱镇组层序地层格架进行砂组划分。结合碎屑组分分析法、重矿物分析法、源区构造判别法对成都凹陷蓬三段进行物源分析,得出成都凹陷蓬三段沉积时不仅有来自龙门山中段的物源还有来自北东方向的物源。然后在已经建立的川西坳陷中段蓬莱镇组层序地层格架的控制下进行成都凹陷蓬三段的沉积体系与特征研究,研究表明在蓬三段沉积时期研究区主要为湖泊—三角洲沉积体系,整体上三角洲比较发育,湖泊相分布范围有限；三角洲相发育有辫状河三角洲以及曲流河三角洲两种类型,以三角洲前缘亚相为主,湖泊相主要发育滨浅湖亚相。在单井分析、连井对比的基础上结合砂地比数据编制了成都凹陷蓬三段砂地比等值线图,并进行了蓬三段沉积微相平面展布图的编制,同时对重点砂组JP25砂组进行了重点研究,绘出其平面展布图,进一步明确沉积微相的展布特征。最后在前人研究基础上结合本次调查研究结果总结出了川西坳陷中段蓬三段沉积相模式,整体为冲积扇—三角洲—湖泊沉积模式。最后结合岩石学特征研究以及物性研究并在前人总结的储层分类评价标准的基础上,进行成都凹陷蓬三段储层预测评价,得出成都凹陷蓬三段储层品质整体最好,较好储层分布范围广,主要分布于马井-什邡～广金-新都-洛带地区一带；中等储层分布更广,在成都凹陷、梓潼凹陷、新场构造带及东坡地区均有大面积分布；较差储层在龙门山前缘分布面积最小。在成都凹陷蓬三段沉积特征研究过程中,得出了以下几点结论：1、在前人研究的基础上,通过大量岩性观察结合以上总结的岩石相、测井相标志等指标进行亚相、微相研究。本次研究在成都凹陷主要识别出三角洲—湖泊沉积体系,以三角洲沉积为主,并在研究区内识别出三角洲平原-三角洲前缘-前三角洲沉积亚相以及滨浅湖沉积亚相等5种亚相类型,以及分流河道、河口坝等微相。2、明确了成都凹陷蓬三段的沉积微相展布,研究区内以三角洲前缘沉积为主,在崇州—郫县地区主要为辫状河三角洲沉积而在北东方向主要为曲流河三角洲沉积,在成都凹陷南部地区发育有滨浅湖沉积。3、分地区、层段建立储层分类评价标准,成都凹陷蓬三段储层品质整体较好,较好储层分布范围广,主要分布于马井-什邡～广金-新都-洛带地区一带；中等储层在研究区内有大面积分布；较差储层主要分布于龙门山前缘。
[Abstract]:Chengdu sag is located in the middle section of Western Sichuan depression, which has been subjected to many tectonic movements such as Indosinian, Yanshan and Himalayan period. In the depression, some paleotectonic structures are formed, which are beneficial to oil and gas accumulation, and these positive structures and slopes become favorable hydrocarbon migration directing zones. At the same time, the Penglai town gas collection is the main gas reservoir capital at present in Western Sichuan depression. There are abundant source and great potential for exploration, so the three section of Peng Peng in Chengdu sag is a potential exploration potential area. The sequence stratigraphic framework of the Penglai town group in the middle section of the West Sichuan depression is divided into sand groups. Combining the analysis method of debris components, heavy mineral analysis, and the source area structural discrimination method, the source analysis of the three section of the Chengdu depression is carried out. It is concluded that the sedimentary three segments of the Chengdu sag not only have the source from the middle section of the Longmen mountain but also the source from the north east direction. Under the control of the sequence stratigraphic framework of the Penglai town group in the middle section of the Western Sichuan depression, the sedimentary system and characteristics of the Pengshan three section of the Chengdu sag are studied. The study shows that the study area in the period of the pengpeng three section is mainly lacustrine delta depositional system, and the whole delta is relatively developed, the distribution of Lake mooring facies is limited, and the delta facies are developed. Two types of Braided River Delta and meandering river delta are composed mainly of delta front subfacies, and lake facies mainly develops shallow lake subfacies. On the basis of single well analysis and the comparison of the wells, the sand ground ratio contour map of the three sections of the Chengdu sag is compiled, and the sedimentary microfacies map of the three section of the Peng is compiled. At the time, the key sand group JP25 sand group was studied, the plane map was drawn and the distribution characteristics of sedimentary microfacies were further clarified. Finally, on the basis of the previous research, the sedimentary facies model of the three section of the middle section of the West Sichuan depression was summed up, and the whole was the alluvial fan delta lake sedimentary model. On the basis of the study of petrological characteristics and physical properties, the reservoir prediction and evaluation of the three member of the Peng three section in the Chengdu sag are carried out on the basis of the reservoir classification evaluation criteria summarized by the predecessors. It is concluded that the reservoir quality of the three section of the Peng Peng is the best, and the better reservoir distribution is wide, mainly distributed in the area of the Ma well Shifang Guang Jin - Xindu - Luodai area; The distribution of the layer is wider in Chengdu sag, Zitong sag, Xinchang tectonic zone and Dongpo area, and the distribution area of the poor reservoir in the Longmen mountain front is the smallest. In the study process of the three section of the Chengdu depression, the following conclusions are obtained: 1, on the basis of the previous research, a large number of lithology observation combined with the above total. In this study, the delta lacustrine depositional system is mainly identified in the Chengdu sag, and the delta plain is the main sedimentary facies in the Chengdu depression, and the delta plain - delta front delta sedimentary subfacies and the shallow lake sedimentary subfacies are identified in the study area. The microfacies.2, such as distributary channel and estuarine dam, clearly show the sedimentary microfacies of the three section of the Chengdu sag, mainly in the study area, mainly in the delta front of the Delta, in the Chongzhou Pixian region, mainly in the braided river delta, and in the eastern direction of the deltaic Delta. In the southern part of the Chengdu sag, the sedimentary.3 of the shallow lake is developed in the southern part of the Chengdu sag. In the area, the reservoir classification evaluation standard is established. The reservoir quality of the three section of the Chengdu sag is better, the better reservoir distribution is wide, mainly distributed in the area of Ma Jing - Shifang - Guang Jin - Xindu Luodai area, and the middle reservoir is distributed in the study area, and the poor reservoir is mainly distributed in the front of the Longmen mountain.
【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

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