直罗油田张村驿油区长8储层特征研究
发布时间：2018-08-15 15:44
【摘要】：直罗油田张村驿位于陕西省富县境内,研究区面积约1000km2,构造位置属于鄂尔多斯盆地陕北斜坡东南部。过去其主要开发层位为长2段,勘探程度及动用程度均很高。近年来,长8段的油气勘探不断有重大突破,许多井试油获工业油流,展现了延长组下组合具有广阔的勘探潜力。因此延长组下组合将成为今后直罗油田探明储量增长和原油上产的重要接替层位,开展此课题的研究对油田可持续发展意义重大。本文以石油地质学、沉积岩石学和储层地质学等理论为指导,以实验测试技术为依托,综合应用野外露头、钻井、测井及生产动态资料,从沉积相和砂体展布研究入手,对长8储层的岩石学特征、物性特征、孔隙结构特征、以及成岩作用进行了研究和分析,取得了以下成果和认识。根据野外露头观察、岩心观察、沉积构造及测井相分析表明,长8期主要发育三角洲前缘亚相的水下分流河道、河道侧翼及分流间湾微相。通过岩心描述及岩石薄片鉴定,认为长8段储层的岩石类型主要为细-极细粒岩屑长石砂岩和长石砂岩,碎屑成分主要为石英、长石、岩屑及少量填隙物,填隙物组分主要为绿泥石、伊利石、碳酸盐矿物、硅质及长石质胶结物等。砂岩的成分成熟度和结构成熟度均较低。根据常规物性资料分析,得出长8段为低孔低渗储层,平均孔隙度为8.12%,平均渗透率为0.25×10-3μm2。根据岩石薄片、铸体薄片、扫描电镜等资料分析,认为长8储层主要发育粒间溶孔、长石溶孔、岩屑溶孔、填隙物内溶孔及微裂隙。根据压汞毛管压力测试资料分析,发现长8段孔喉分选性较差,喉道类型以细喉和微喉为主。通过岩石铸体薄片观察、扫描电镜及X射线衍射等测试技术分析,认为研究区成岩作用类型主要为机械压实作用、胶结作用、交代作用、溶蚀作用和破裂作用。根据镜质体反射率(Ro)、有机质成熟度、I/S中的S%、石英加大级别、颗粒接触类型、孔隙类型等指标综合判断认为,研究区长8处于中成岩阶段B期。根据储层分类标准,本文将研究区长8储层分为四类:Ⅰ类优质储层、Ⅱ类中等储层、Ⅲ类差储层、Ⅳ类致密储层,并从多个角度对长8储层进行了对比及评价。
[Abstract]:Zhangcuyi Oilfield is located in Fuxian County, Shaanxi Province, with an area of about 1000km2. The tectonic location belongs to the southeast of North Shaanxi Slope in Ordos Basin. In the past, the main development horizon was Chang 2, and the degree of exploration and production was very high. In recent years, great breakthroughs have been made in oil and gas exploration in Chang 8, and many wells have been tested for industrial oil flow, which shows that the lower assemblage of Yanchang formation has broad exploration potential. Therefore, the Yanchang formation combination will become an important replacement horizon for proven reserves growth and crude oil production in Zhiluo Oilfield in the future, and it is of great significance to carry out the research on this subject for the sustainable development of the oilfield. Guided by the theories of petroleum geology, sedimentary petrology and reservoir geology, and relying on the experimental test technology, this paper comprehensively applies field outcrop, drilling, logging and production dynamic data to study the distribution of sedimentary facies and sand bodies. The petrological characteristics, physical properties, pore structure characteristics and diagenesis of Chang 8 reservoir are studied and analyzed. According to field outcrop observation, core observation, sedimentary structure and log facies analysis, the main subfacies of delta front subfacies, channel flanking and interdistributary bay microfacies were developed in Chang8 period. The rock types of Chang 8 reservoir are mainly fine-very fine-grained lithic feldspar sandstone and feldspar sandstone, and the clastic components are mainly quartz, feldspar, lithic debris and a small amount of interstitial matter. The interstices are mainly chlorite, Illite, carbonate minerals, siliceous and feldspar cements. The composition maturity and structure maturity of sandstone are low. Based on the analysis of conventional physical properties, it is concluded that Chang 8 is a low porosity and low permeability reservoir with an average porosity of 8.12 and an average permeability of 0.25 脳 10 ~ (-3) 渭 m ~ (2). According to the data analysis of rock slice, cast slice and scanning electron microscope, it is concluded that intergranular dissolved pore, feldspar dissolved pore, cuttings dissolved pore, dissolving pore and microfissure are mainly developed in Chang 8 reservoir. According to the analysis of pressure test data of mercuric capillary, it is found that the separation of pore throat in long 8 section is poor, and the throat types are mainly fine throat and microlarynx. Based on the observation of thin section of rock cast, SEM and X-ray diffraction, it is concluded that the diagenesis types in the study area are mainly mechanical compaction, cementation, metasomatism, dissolution and rupture. According to the Synthetical judgement of vitrinite reflectance (Ro),) organic matter maturity in I / S, quartz increasing grade, particle contact type, pore type and so on, the study area Chang 8 is in stage B of middle diagenesis. According to the criteria of reservoir classification, this paper classifies Chang8 reservoir into four categories: I type high quality reservoir, 鈪，
本文编号：2184665
[Abstract]:Zhangcuyi Oilfield is located in Fuxian County, Shaanxi Province, with an area of about 1000km2. The tectonic location belongs to the southeast of North Shaanxi Slope in Ordos Basin. In the past, the main development horizon was Chang 2, and the degree of exploration and production was very high. In recent years, great breakthroughs have been made in oil and gas exploration in Chang 8, and many wells have been tested for industrial oil flow, which shows that the lower assemblage of Yanchang formation has broad exploration potential. Therefore, the Yanchang formation combination will become an important replacement horizon for proven reserves growth and crude oil production in Zhiluo Oilfield in the future, and it is of great significance to carry out the research on this subject for the sustainable development of the oilfield. Guided by the theories of petroleum geology, sedimentary petrology and reservoir geology, and relying on the experimental test technology, this paper comprehensively applies field outcrop, drilling, logging and production dynamic data to study the distribution of sedimentary facies and sand bodies. The petrological characteristics, physical properties, pore structure characteristics and diagenesis of Chang 8 reservoir are studied and analyzed. According to field outcrop observation, core observation, sedimentary structure and log facies analysis, the main subfacies of delta front subfacies, channel flanking and interdistributary bay microfacies were developed in Chang8 period. The rock types of Chang 8 reservoir are mainly fine-very fine-grained lithic feldspar sandstone and feldspar sandstone, and the clastic components are mainly quartz, feldspar, lithic debris and a small amount of interstitial matter. The interstices are mainly chlorite, Illite, carbonate minerals, siliceous and feldspar cements. The composition maturity and structure maturity of sandstone are low. Based on the analysis of conventional physical properties, it is concluded that Chang 8 is a low porosity and low permeability reservoir with an average porosity of 8.12 and an average permeability of 0.25 脳 10 ~ (-3) 渭 m ~ (2). According to the data analysis of rock slice, cast slice and scanning electron microscope, it is concluded that intergranular dissolved pore, feldspar dissolved pore, cuttings dissolved pore, dissolving pore and microfissure are mainly developed in Chang 8 reservoir. According to the analysis of pressure test data of mercuric capillary, it is found that the separation of pore throat in long 8 section is poor, and the throat types are mainly fine throat and microlarynx. Based on the observation of thin section of rock cast, SEM and X-ray diffraction, it is concluded that the diagenesis types in the study area are mainly mechanical compaction, cementation, metasomatism, dissolution and rupture. According to the Synthetical judgement of vitrinite reflectance (Ro),) organic matter maturity in I / S, quartz increasing grade, particle contact type, pore type and so on, the study area Chang 8 is in stage B of middle diagenesis. According to the criteria of reservoir classification, this paper classifies Chang8 reservoir into four categories: I type high quality reservoir, 鈪，
本文编号：2184665
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