塔中地区中古5-7井区中下奥陶统鹰山组储层特征研究
发布时间：2018-08-18 09:24
【摘要】：论文以塔里木盆地塔中中古5-7井区中下奥陶统鹰山组海相碳酸盐岩层系为研究对象,以碳酸盐沉积学以及储层地质学理论为指导,同时采用多学科、多手段综合分析方法,通过岩心观察、铸体薄片、成像测井、扫描电镜等结合测试和地震资料成果,围绕碳酸盐岩储层沉积特征、储层物性特征、展布规律及控制因素等进行了系统研究。 中古5-7井区中下奥陶统鹰山组自上而下分为鹰一段、鹰二段、鹰三段和鹰四段,鹰一段地层整体上遭受不同程度剥蚀。由北向南,鹰山组地层剥蚀程度逐渐加大、地层厚度逐渐减小,在塔中1号坡折带附近地层残余厚度最大；在平行塔中1号坡折带方向,鹰山组地层西薄东厚。鹰山组不同层段地层总体沿平行塔中号坡折带方向呈带状展布,地层横向上厚度差异较小,分布较稳定,鹰山组储层发育与小层分布具有较好的相关性。区内鹰山组主要发育开阔台地相沉积,可进一步划分出高能砂屑滩、滩间海、低能砂屑滩等亚相环境,纵向上表现为台内滩与滩间海的多旋回组合。在靠近号带的鹰一段高能砂屑滩主要分布在中古5井-中古1井以东地区,中低能砂屑滩呈斑状、线状平行号带分布于中古5-1井-中古4井-中古7井一带。鹰二段高能砂屑滩呈北西-南东向大面积成片分布,中低能砂屑滩和滩间海呈斑状沿平行号带方向分布。 鹰山组储集岩岩石类型复杂,孔隙度由白云岩过渡至灰岩具逐渐变小趋势。宏观储集空间类型以溶蚀孔洞为主,局部发育洞穴及裂缝；微观储集空间类型以粒间溶孔、粒内溶孔、晶间孔、微裂缝及溶蚀缝为主。储层整体上纵向叠置、横向成层、平面上大面积分布,局部具有较强的非均质性和穿层性。区内鹰一段第3、5层亮晶砂屑灰岩发育段储层较为有利,储层主要为特低孔低渗储层,总体属Ⅱ-Ⅲ类储层。以孔洞型和裂缝-孔洞型储层类型为主。中古5-7井区中下奥陶统鹰山组碳酸盐岩储层主要控制因素为沉积相带、成岩作用和构造作用。其中位于有利沉积相带的高能砂屑滩为储层发育的基础,层间岩溶和埋藏岩溶作用为控制鹰山组储层发育及展布的关键,构造作用产生的裂缝及断裂改善储层渗滤性能。有利储层的分布受台内滩相带和岩溶发育有利带及断裂活动等综合控制,总体沿断裂、岩溶发育区分布。较好储层发育带位于工区东南部ZG7井-ZG7-H1井-ZG702井-ZG7-2井一带、ZG6井-ZG6-2井一带及工区南部ZG518-ZG434井一带。
[Abstract]:The paper takes the marine carbonate series of Yingshan formation of middle and lower Ordovician in Tarim Basin as the research object, and takes carbonate sedimentology and reservoir geology theory as the guidance, at the same time, adopts multi-disciplinary and multi-means comprehensive analysis method. By means of core observation, casting thin slice, imaging logging, scanning electron microscope and so on, the sedimentary characteristics, physical properties, distribution and controlling factors of carbonate reservoir are systematically studied. The Yingshan formation of the middle and lower Ordovician in the middle and lower Ordovician well area is divided from top to bottom into Ying1 member, Ying2 member, Ying3 formation and Ying4 formation, and the formation of the first member of Yingyi formation has been denudated to varying degrees as a whole. From north to south, the erosion degree of Yingshan formation gradually increases, the formation thickness decreases gradually, and the residual thickness is the largest near slope 1 break zone in Tazhong, and in parallel with the direction of slope 1 break zone in Tazhong formation, the formation of Yingshan formation is thick in the west and east. The strata of different strata of Yingshan formation are distributed along the direction of parallel Tazhong slope break, the thickness difference is small and the distribution is stable. The reservoir development of Yingshan formation has a good correlation with the distribution of small layers. The Yingshan formation is mainly composed of open platform facies, which can be further divided into high energy sand and debris beach, interbeach sea and low energy sand debris beach subfacies environment. The longitudinal manifestation is the multi cycle combination of the platform beach and the inter beach sea. In the area east of Middle 5 well to Middle ancient 1 well, the middle and low energy sand debris beach is spotted, and the linear parallel belt is distributed in the middle ancient 5-1 well, the middle ancient 4 well and the middle ancient 7 well. The high energy sand debris beach of the second stage of Ying is distributed in a large area in the north-west to the south east direction, and the middle and low energy sand debris beach and the interbeach sea distribute in the direction of parallel number zone. The reservoir rock types of Yingshan formation are complex and the porosity transition from dolomite to limestone tends to decrease gradually. The main types of macroscopic reservoir space are dissolution holes, while the microcosmic reservoir spaces are mainly composed of intergranular dissolved pores, intragranular dissolved pores, intergranular pores, microcracks and dissolution joints. As a whole, the reservoir is vertically overlaid, stratified laterally, distributed in a large area on the plane, and has strong heterogeneity and stratification. The reservoir developed in the third and fifth formation of Ying-1 formation is favorable, and the reservoir is mainly low porosity and low permeability reservoir, which belongs to type 鈪，
本文编号：2189047
[Abstract]:The paper takes the marine carbonate series of Yingshan formation of middle and lower Ordovician in Tarim Basin as the research object, and takes carbonate sedimentology and reservoir geology theory as the guidance, at the same time, adopts multi-disciplinary and multi-means comprehensive analysis method. By means of core observation, casting thin slice, imaging logging, scanning electron microscope and so on, the sedimentary characteristics, physical properties, distribution and controlling factors of carbonate reservoir are systematically studied. The Yingshan formation of the middle and lower Ordovician in the middle and lower Ordovician well area is divided from top to bottom into Ying1 member, Ying2 member, Ying3 formation and Ying4 formation, and the formation of the first member of Yingyi formation has been denudated to varying degrees as a whole. From north to south, the erosion degree of Yingshan formation gradually increases, the formation thickness decreases gradually, and the residual thickness is the largest near slope 1 break zone in Tazhong, and in parallel with the direction of slope 1 break zone in Tazhong formation, the formation of Yingshan formation is thick in the west and east. The strata of different strata of Yingshan formation are distributed along the direction of parallel Tazhong slope break, the thickness difference is small and the distribution is stable. The reservoir development of Yingshan formation has a good correlation with the distribution of small layers. The Yingshan formation is mainly composed of open platform facies, which can be further divided into high energy sand and debris beach, interbeach sea and low energy sand debris beach subfacies environment. The longitudinal manifestation is the multi cycle combination of the platform beach and the inter beach sea. In the area east of Middle 5 well to Middle ancient 1 well, the middle and low energy sand debris beach is spotted, and the linear parallel belt is distributed in the middle ancient 5-1 well, the middle ancient 4 well and the middle ancient 7 well. The high energy sand debris beach of the second stage of Ying is distributed in a large area in the north-west to the south east direction, and the middle and low energy sand debris beach and the interbeach sea distribute in the direction of parallel number zone. The reservoir rock types of Yingshan formation are complex and the porosity transition from dolomite to limestone tends to decrease gradually. The main types of macroscopic reservoir space are dissolution holes, while the microcosmic reservoir spaces are mainly composed of intergranular dissolved pores, intragranular dissolved pores, intergranular pores, microcracks and dissolution joints. As a whole, the reservoir is vertically overlaid, stratified laterally, distributed in a large area on the plane, and has strong heterogeneity and stratification. The reservoir developed in the third and fifth formation of Ying-1 formation is favorable, and the reservoir is mainly low porosity and low permeability reservoir, which belongs to type 鈪，
本文编号：2189047
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