川东北部罗家寨构造带飞仙关组储层评价
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摘要
本论文主要应用高分辨层序地层学、沉积岩石学、储层地质学以及地质统计学等知识对川东北部地区罗家寨气田三叠系飞仙关组鲕滩白云岩储层进行了细致的研究,主要有三个方面的内容:(1) 罗家寨及周边区域沉积相描述;(2) 罗家寨气田三叠系飞仙关组白云岩鲕滩储层特征描述;(3) 罗家寨气田三叠系飞仙关组白云岩鲕滩储层分布规律及主控因素研究。
首先,从野外露头、20口井的岩心观察入手,结合大量宏观沉积相和岩石学特征研究资料综合分析,进行高分辨率层序地层学研究及沉积相描述。依据野外、钻井、测井等多种手段,将罗家寨及周边区域飞仙关组划分为两个三级层序Ⅲ1和Ⅲ2,每个三级层序由海侵体系域与高位体系域构成;两个三级层序间的界面为淹没不整合面。以Th/K作为指标,进行频谱分析,划分出11个四级层序。并分析了不同高频层序中沉积相展布特征。
其次,从研究工区飞仙关组鲕滩储层的储层岩石学特征、储集空间特征、常规物性特征、孔隙结构特征等几个方面入手,将鲕滩白云岩储层划分四类,并就各类储集岩的储、渗性能以及各类储集岩的岩石类型、孔隙类型及分布情况进行了分类评价。
最后,从构造、沉积相及高分辨层序地层学格架方面,总结出了工区飞仙关组鲕滩储层空间展布规律和储层发育的主控因素。在此基础上,对研究区飞仙关组鲕滩储层进行平面分布评价,并对有利区进行预测。研究区的储层属于裂缝孔隙型储层,罗家寨构造东段的储层物性相对较好。预测在城口—鄂西海槽边缘、泻湖边缘可能发育着较好的鲕滩储层。
The Feixianguan Formation in Luojiazhai Structure Zone of northeastern Sichuan Basin contains excellent oolitic-shoal reservoirs. However, many exploration and development difficulties still exist. In order to solve some of these problems,according to the principles of the structural geology, the high-resolution sequence stratigraphy , the sedimentary geology and petrology , three mian fields have been probed as follows: (1) the description of sedimentary facies around Luojiazhai Structure Zone, (2) the reservoir characterization of the dolomite oolitic shoals ,(3) the study of the spatial distribution, the main controls of reservoir-quality and the prediction of the dolomite oolitic formation.Firstly, based on the field outcrop, the description of 20 well cores , a lot of study achievements of the thin section petrography and field studies of sedimentary facies, the sedimentary facies of the Luojiazhai region has been probed, using the high-resolution sequence stratigraphy .According to data from field surveys, drilling, logging and other means, 3rd-order (Ⅲ_2 and Ⅲ_2) have been recognized within the Feixianguan Formation. Each 3rd-order sequence comprises TST and HST. The interface between Ⅲ_1 and Ⅲ_2 present as a drowned unconformable surface. Based on frequency spectrum analysis with Th/K as the main index, eleven 4th-order sequences have been outlined in the Feixianguan Formation. And the distribution of the sedimentary facies of the oolitic shoals formation in each high-frequency sequence has been outlined.Secondly, based on the characteristic of rock mechanics,reservoir space, reservoir physical property and pore structure the reservoir rock and pore structure of the Feixianguan Formation of the oolitic shoals have been subdivided into 4 types. Reservoir-quality evaluation of each every type of has been outlined, which contains reservoir physical property, production capacity, distribution of each reservoir rock types, and the type and distribution of reservoir space.Finally, the spatial distribution and the main controls of the reservoir-quality of the dolomite oolitic formation haves been evaluated .At the same time, the distribution of the oolitic dolomite has been predicted preliminarily. The reservoirs in Luojiazhai area are porous-type , and physical property in the eastern structure zone is better than the western. The favorable reservoirs consists of the ridge of larger oolitic shaol complexity or bars.
首先,从野外露头、20口井的岩心观察入手,结合大量宏观沉积相和岩石学特征研究资料综合分析,进行高分辨率层序地层学研究及沉积相描述。依据野外、钻井、测井等多种手段,将罗家寨及周边区域飞仙关组划分为两个三级层序Ⅲ1和Ⅲ2,每个三级层序由海侵体系域与高位体系域构成;两个三级层序间的界面为淹没不整合面。以Th/K作为指标,进行频谱分析,划分出11个四级层序。并分析了不同高频层序中沉积相展布特征。
其次,从研究工区飞仙关组鲕滩储层的储层岩石学特征、储集空间特征、常规物性特征、孔隙结构特征等几个方面入手,将鲕滩白云岩储层划分四类,并就各类储集岩的储、渗性能以及各类储集岩的岩石类型、孔隙类型及分布情况进行了分类评价。
最后,从构造、沉积相及高分辨层序地层学格架方面,总结出了工区飞仙关组鲕滩储层空间展布规律和储层发育的主控因素。在此基础上,对研究区飞仙关组鲕滩储层进行平面分布评价,并对有利区进行预测。研究区的储层属于裂缝孔隙型储层,罗家寨构造东段的储层物性相对较好。预测在城口—鄂西海槽边缘、泻湖边缘可能发育着较好的鲕滩储层。
The Feixianguan Formation in Luojiazhai Structure Zone of northeastern Sichuan Basin contains excellent oolitic-shoal reservoirs. However, many exploration and development difficulties still exist. In order to solve some of these problems,according to the principles of the structural geology, the high-resolution sequence stratigraphy , the sedimentary geology and petrology , three mian fields have been probed as follows: (1) the description of sedimentary facies around Luojiazhai Structure Zone, (2) the reservoir characterization of the dolomite oolitic shoals ,(3) the study of the spatial distribution, the main controls of reservoir-quality and the prediction of the dolomite oolitic formation.Firstly, based on the field outcrop, the description of 20 well cores , a lot of study achievements of the thin section petrography and field studies of sedimentary facies, the sedimentary facies of the Luojiazhai region has been probed, using the high-resolution sequence stratigraphy .According to data from field surveys, drilling, logging and other means, 3rd-order (Ⅲ_2 and Ⅲ_2) have been recognized within the Feixianguan Formation. Each 3rd-order sequence comprises TST and HST. The interface between Ⅲ_1 and Ⅲ_2 present as a drowned unconformable surface. Based on frequency spectrum analysis with Th/K as the main index, eleven 4th-order sequences have been outlined in the Feixianguan Formation. And the distribution of the sedimentary facies of the oolitic shoals formation in each high-frequency sequence has been outlined.Secondly, based on the characteristic of rock mechanics,reservoir space, reservoir physical property and pore structure the reservoir rock and pore structure of the Feixianguan Formation of the oolitic shoals have been subdivided into 4 types. Reservoir-quality evaluation of each every type of has been outlined, which contains reservoir physical property, production capacity, distribution of each reservoir rock types, and the type and distribution of reservoir space.Finally, the spatial distribution and the main controls of the reservoir-quality of the dolomite oolitic formation haves been evaluated .At the same time, the distribution of the oolitic dolomite has been predicted preliminarily. The reservoirs in Luojiazhai area are porous-type , and physical property in the eastern structure zone is better than the western. The favorable reservoirs consists of the ridge of larger oolitic shaol complexity or bars.
引文
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[21] Read, J.F. Overview of carbonate platform sequeces, cycle stratigraphy and reservoirs in greenhouse and icehouse world .in J.F. Read, C. Kerans, and L.J. Weber, eds. Milankovitch Sea Level Changes, Cycles and Reservoirs on Carbonate Plaatforms in greenhouse and icehouse world. SEPM Short Course Notes, 1995, 35:1～35
[22] 任康绪.扫描电镜对低渗透储油层砂岩基质内孔隙铸体法分析的剖析.化工矿产地质,1997,19(1):69-71
[23] 曹寅,朱樱,黎琼.扫描电镜与图象分析在储层研究中的联合应用.石油实验地质,2001,23(2):221-225
[24] 魏宝和.扫描电镜的铸体分析、微粒分析在储层研究中应用.中国石油天然气总公司科技发展部,1991-10
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