鄂尔多斯盆地柴家河油区长6~1地质特征研究

发布时间：2018-08-22 07:48

【摘要】：柴家河油区位于鄂尔多斯盆地陕北斜坡东部地区,区域构造为一西倾的单斜,地层倾角小于1°,千米坡降7-10米,单斜背景上局部发育低幅度鼻状构造。该油区是横山采油厂2008年的主力开发和上产区之一,主力产层为中生界延长组长6油层。本次通过大分层、细分层对比,共划分出1个油层组、3个小层；主力小层为长611和长612。通过大量的岩芯观察、野外剖面调研以及实验测试资料分析,孔隙类型主要为残余粒间孔及溶蚀粒间孔,成岩作用是影响储层物性的主要因素,压实作用和胶结作用是导致砂岩物性变差的主要原因。研究区长6’储层段平均孔隙度为11.98%,平均渗透率为0.98×10-3μm2,为中低孔低渗储层类型。通过储层非均质性的研究,认为储层物性纵向非均质性不强；平面上各小层储层物性分布集中,孔隙度分布表现为单峰状,呈正态分布,渗透率个别层呈多峰状分布,说明平面分布具有一定的非均质性,相对较高孔较高渗储层主要分布于主河道发育区。从主力油层分布情况研究表明：柴家河油区长6’油藏储层段不长,主力油层集中井段也不长；单井控制的含油小层数少、油层厚度薄；单井控制储量低、单井产能低：同时储层岩性、物性、流体性质也比较接近。在储集层非均质性和孔隙结构研究基础上,对研究区做了“四性”关系研究,建立了测井解释模型来对储层参数进行研究,依据测井解释图版,确定了研究区物性下限和电性下限,最后开展了研究区地质储量综合评价,研究表明：研究区长61油藏探明叠合含油面积5.0km2,探明石油地质储量198.06×104t,可采储量为22.38×104t,属小型储量规模油田,原油可采储量丰度为39.4×104m3/km2,属较高丰度油田,按油藏中深计算,属中浅层油藏,按储层物性分类,属中低孔低渗油藏。
[Abstract]:The Qaijiahe oil area is located in the eastern part of the northern Shaanxi slope in Ordos basin. The regional structure is a westward dip monoclinal, the stratigraphic dip angle is less than 1 掳, the slope of kilometer is 7-10 meters, and the low-amplitude nasal structure is developed locally in the monoclinal background. The oil area is one of the main development and production areas of Hengshan Oil production Plant in 2008, and the main production zone is Yanchang formation No. 6 of Mesozoic. Through large stratification and subdivision layer correlation, a total of 1 oil layer formation, 3 sub-layers, the main sublayer is Chang611 and Chang612. Through a large number of core observation, field profile investigation and experimental data analysis, the pore types are mainly residual intergranular pores and dissolved intergranular pores, and diagenesis is the main factor affecting reservoir physical properties. Compaction and cementation are the main reasons for the deterioration of sandstone physical properties. The average porosity and permeability of Chang6'reservoir are 11.98 and 0.98 脳 10 ~ (-3) 渭 m ~ (2), respectively. Through the study of reservoir heterogeneity, it is considered that the longitudinal heterogeneity of reservoir physical property is not strong, the distribution of physical properties of each small layer on the plane is concentrated, the distribution of porosity is unimodal, the distribution of porosity is normal distribution, and the permeability of individual layers is multi-peak distribution. It shows that the plane distribution has certain heterogeneity and the relatively high porosity and high permeability reservoirs are mainly distributed in the main river development area. The study on the distribution of the main reservoir shows that the reservoir section of Chang6'reservoir in Chaijiahe oil area is not long, the concentrated well section of the main reservoir is not long, the number of oil-bearing small layers controlled by single well is small, the reservoir thickness is thin, and the control reserve of single well is low. Low productivity of single well: reservoir lithology, physical properties, fluid properties are similar. Based on the study of reservoir heterogeneity and pore structure, the relationship of "four properties" is studied in the study area, and a log interpretation model is established to study reservoir parameters. The lower limit of physical property and the lower limit of electric property of the study area are determined. Finally, the comprehensive evaluation of geological reserves in the study area is carried out. The results show that the proved superimposed oil-bearing area of Chang61 reservoir is 5.0 km ~ 2, the proved petroleum geological reserves are 198.06 脳 10 ~ 4t, recoverable reserves are 22.38 脳 10 ~ 4 t, and the recoverable reserves are 39.4 脳 10 ~ 4 m ~ 3 / km ~ 2, which are calculated according to the depth of the reservoir. It is a medium and shallow reservoir, classified by reservoir physical property, and belongs to low porosity and low permeability reservoir.
【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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