鄂尔多斯盆地致密油形成条件研究

发布时间：2019-02-25 09:47

【摘要】：鄂尔多斯盆地三叠系延长组致密油资源丰富,本文针对鄂尔多斯盆地三叠系延长组致密油,从烃源岩、储层特征、源储关系等方面综合分析了鄂尔多斯盆地致密油形成条件,并优选了致密油有利区带。在此基础上,构建了鄂尔多斯盆地致密油资源优度综合评价指标体系,运用层次分析法和双因素法对延长组致密油开展了综合评价与区划研究。结合国内外致密油勘探开发现状,本文将储层地面空气渗透率小于1md,孔隙度小于12%,石油未经过大规模长距离运移的烃源岩外油藏称为致密油。鄂尔多斯盆地延长组主要为致密砂岩储层。以陇东地区延长组致密砂岩油为例,研究了致密砂岩油的形成条件。延长组中下段共有两类烃源岩,长7油页岩和长4+5-长9暗色泥岩,源岩分布面积广,有机碳含量高,普遍达成熟阶段;致密储层长石岩屑含量相对较高,以次生孔隙为主,孔隙结构复杂,主要聚集于临近生烃中心的三角洲前缘水下分流河道、湖盆中央的重力流沉积砂体中,与源岩大面积接触,中—强压实作用是陇东地区延长组砂岩储层致密的主要原因,其次为胶结作用。明确了储层致密史与成藏史之间关系,认为储层先期差异致密,而后大规模成藏。平面上将延长组有利砂体分布图与有效烃源岩图叠合,优选出鄂尔多斯盆地致密砂岩油有利区,长8致密油主要分布于西北和西南部,长7致密油主要分布于华池一带,长6致密油分布广泛。围绕矿产资源规划编制的需求,结合鄂尔多斯致密油资源研究现状,从勘探和开发两个大的方面开展其资源优度综合评价,构建了致密油综合评价指标体系,包括资源条件和外部条件(地形地貌、可压裂性)。运用双因素法将致密油有利区划分为:优先勘探(开发)区、次级勘探(开发)区和勘探(开发)后备区。优先勘探(开发)区为西南部和湖盆中部。
[Abstract]:The dense oil resources of the Triassic Yanchang Formation in the Ordos Basin are rich, and the dense oil formation condition of the Ordos Basin is comprehensively analyzed from the aspects of the hydrocarbon source rock, the reservoir characteristics and the source storage relationship in the Triassic Yanchang Formation of the Ordos Basin, and the favorable zone of the compact oil is preferred. On the basis of this, the comprehensive evaluation index system of the dense oil resources in the Ordos Basin is constructed, and the comprehensive evaluation and zoning of the extended group of dense oil are carried out by using the analytic hierarchy process and the two-factor method. In combination with the present situation of the exploration and development of the dense oil at home and abroad, the permeability of the ground air of the reservoir is less than 1md, the porosity is less than 12%, and the petroleum not subjected to large-scale long-distance migration is known as the dense oil. The Yanchang Formation in the Ordos Basin is mainly a tight sandstone reservoir. In this paper, the formation conditions of tight sandstone oil were studied by using the dense sandstone oil of Longdong area as an example. In the extended group, there are two types of hydrocarbon source rocks, 7 oil shale and 4 + 5-long 9 dark mudstone, the source rock has a wide distribution area and high organic carbon content, and the mature stage is generally reached; the compact reservoir feldspar debris content is relatively high, the secondary pore is the main pore, the pore structure is complex, It is mainly concentrated in the subaqueous distributary channel of the delta front of the adjacent hydrocarbon center, and the gravity flow in the center of the lake basin is in contact with the source rock, and the strong compaction of the medium is the main cause of the compaction of the sandstone reservoir in the extension group in the Longdong area, and the second is the cementation. The relationship between the reservoir dense history and the reservoir history is defined, and the reservoir early difference is considered to be compact and then large-scale is hidden. in that plane, the favorable sand body distribution map of the extension group is superposed with the effective hydrocarbon source rock pattern, and the favorable region of the tight sandstone oil in the Ordos basin is preferably formed, and the long 8-dense oil is mainly distributed in the northwest and the south-west, and the long 7-dense oil is mainly distributed in the China basin, and the long 6-dense oil is widely distributed. According to the demand of the development of the mineral resources planning, combined with the present situation of the study of the resources of the compact oil in the ordos, the comprehensive evaluation of its resources is carried out from two large aspects of exploration and development, and the comprehensive evaluation index system of the compact oil is constructed, including the resource conditions and the external conditions (topography, Fracturing). The two-factor method is used to divide the favorable region of the compact oil into the priority exploration (development) area, the secondary exploration (development) area and the exploration (development) reserve area. The priority areas for exploration (development) are in the south-west and in the middle of the lake basin.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【参考文献】