叙利亚G油田C组储层展布分析

在叙利亚G油田的油气勘探中,依据层序地层学工作方法和原理,充分利用高分辨率层序地层学地层对比技术,应用测井、钻井、地震资料,选取等时界面作为地层对比的区域性标志层,建立C组各小层的等时地层格架,在此基础上利用伽马、密度特性反演剖面预测储层,最后通过研究岩性特征确定有利储集相带的展布.     

The geochemical characteristics and origin of crude oils in the Kekeya Oilfield,Xinjiang, China

GC/MS and GC/MS/MS techniques were employed to describe the characteristics of biomarker assemblages in two sets of hydrocarbon source rocks, Jurassic and Permian, in southwestern Tarim, and the parameters for the classification of the two sets of hydrocarbon source rocks have been established. It is found that diahopane and C30-unknown terpane are abundant in Permian samples, the contents of diahopane in Jurassic samples are relatively low, and terpenoids have been detected in Jurassic samples but not in Permian source rock samples. Kekeya crude oils are abundant in diahopane and C30-unknown terpane. The results of fine oil-rock correlation indicated that Kekeya crude oils were derived mainly from the Permian hydrocarbon source rocks. However, a small amount of diterpenoid was detected in the crude oils, indicating that the Jurassic hydrocarbon source rocks also made a certain contribution to Kekeya crude oils.     

曲流河古河道储层构型精细解剖——以孤东油田七区西馆陶组为例

以胜利油区孤东油田七区西为例,在沉积微相研究的基础上,主要应用研究区岩心、测井,动态等资料,对曲流河古河道砂体进行了系统的储层层次构型精细解剖。在点坝定量分布模式的指导下,根据点坝砂体垂向上典型的正韵律、砂体厚度大以及紧邻废弃河道分布等特征,在研究区Ng522单层复合河道砂体内部识别出2个单一点坝。综合露头和现代沉积的研究成果、经验公式预测以及对子井分析,建立了研究区点坝内部构型定量模式,以单井上识别的泥质侧积层作为依据,点坝内部定量模式及动态监测结果作为指导,进行模式拟合,达到系统解剖点坝内部构型的目的。建立了点坝内部泥质侧积层控制的剩余油分布模式,提出了采用在点坝砂体中上部钻水平井的方式开采侧积层控制的剩余油。点坝构型解剖成果在研究区得到了较好的应用效果,而且对类似油田储层精细研究及剩余分布预测都有较好的借鉴作用。     

Evolution of the Moxizhuang Oil Field, Central Junggar Basin, Northwest China

Current oil saturation in the Moxizhuang (莫西庄) Oil Field in central Janggar (准噶尔) basin was evaluated by logging interpretation and measured on core samples, and the paleo-oil saturation in both the pay zones and water zones was investigated by graln-containing-oil inclusion (GOI) analysis.The pay zones in this field have low oil saturation and display low resistivity and small contrast between pay zones and water zones, and are classified as low-porosity, low oil saturation, and low resistivity reservoirs. Both the current low oil-saturation pay zones and the water zones above 4 365 m have high GOI values (up to 38%), suggesting high paleo-oil saturation. The significant difference between current oil saturation from both logging interpretation and core sample measurement and paleo-oil saturation indicated by GOI analysis suggests that this low oil-saturation field evolved from a high oil-saturation pool. Lateral re-migration and spill of formally trapped oil owing to changes in structural configuration since Neogene was the most plausible mechanism for oil loss in the Moxizhuang Oil Field.The combined effects of differential accumulation in the charge phase and the differential re-migration and spill of accumulated oil in Neogene are responsible for the complicated correlation between residual oil saturation and porosity/permeability of the reservoir sandstones and the distribution of low oil-saturation pay zones and paleo-oil zones (current water zones).     

油田开发对庆阳市水资源的污染现状及防治对策探讨

石油资源作为庆阳市的主导矿产资源,对庆阳市、甘肃省乃至全国的经济建设都起到了推动作用。然而,石油开发也对油田矿区的水资源环境造成了很大的破坏。通过对庆阳市境内石油开发造成的水资源的污染现状及水资源保护存在的问题进行分析,并有探讨性的提出防治的对策,旨在促进石油的合理、有序开发,为保护水资源环境提供参考。     

安塞油田长2油层成岩作用及其对储层物性的影响

安塞地区长2油层储层以中细粒长石砂岩为主,主要成岩矿物为绿泥石环边、方解石胶结物、石英和长石加大生长、伊利石、伊-蒙混层、钠长石和高岭石等。绿泥石环边的发育对原生粒间孔的保存起到有利的作用。石英加大级别达级,加大边含有丰富的有机包体,均一温度范围48.1～76.5℃,烃类进入储层的时间为早白垩世中期至晚白垩世。储层发育多种孔隙类型,面孔率平均为11.60%,主要类型有粒间孔、骨架颗粒溶孔和微裂缝等。残余粒间孔和骨架颗粒溶孔是本区长2储层的主要孔隙类型。根据成岩作用的矿物岩石学标志、有机质成熟度及古温度,将长2油层砂岩的成岩作用划分为3个成岩阶段:早成岩阶段、晚成岩阶段和表生成岩阶段。储层性质明显地受到沉积微相和成岩作用的影响,沉积物粒度较粗、厚度较大的分流河道储集物性明显优于各种粒度较细、厚度较薄的分流间席状砂体。     

新肇地区葡萄花油层流体性质识别方法

油水层录井识别与评价工作是地质录井工作中的重要环节之一，随着油田勘探工作的深入，对油水层进行简单定性判断的评价技术和方法，已不能满足勘探开发的需要，尤其是象松辽盆地新肇地区油质较轻的葡萄花油层(原油密度0．74-0.82g/，cm^3)，解释符合率更低．为此，笔提出了葡萄花油层流体性质识别方法：首先建立区块解释标准，     

断裂对塔北地区哈拉哈塘油田奥陶系非暴露岩溶缝洞型储集层的控制作用*

塔里木盆地海相碳酸盐岩缝洞型储集层形成机理复杂,非均质性极强。当前以塔河油田为代表的潜山风化壳缝洞型储集层是碳酸盐岩地层暴露地表受到大气淡水淋滤所形成的,而在塔北地区哈拉哈塘油田奥陶系发育的非暴露区仍存在大量非暴露岩溶缝洞型储集层。在充分认识该油田区域构造背景的基础上,选取油田非暴露区典型区块,应用岩石学、地球化学等资料,对非暴露岩溶缝洞型储集层进行研究。研究认为:(1)大气淡水是非暴露区岩溶作用最关键的岩溶流体,岩溶储集层的形成并不受热液影响;(2)非暴露区存在“三期三级”构造缝和“两期三级”走滑断裂,断裂及伴生构造裂缝是非暴露区岩溶缝洞型储集层发育的必要条件;(3)从断裂对岩溶的控制出发将缝洞型储集层细分为早期断裂和明河双控洞穴、晚期断控洞穴、早期裂缝孔洞和晚期微裂缝孔洞4类;(4)非暴露区非暴露缝洞型储集层先后经历了加里东中期断裂发育、良里塔格组水系下切溶蚀、晚加里东—早海西期断裂发育3个主要过程。此研究深化了非暴露缝洞型储集层的形成机理,并在一定程度上拓宽了非暴露区岩溶储集层勘探开发的思路。     

八面河油田沙三段储层砂体层内非均质性研究与探讨

以八面河油田沙三段为例,从测井解释储层参数、储层砂体韵律性、沉积相分析和非均质类型研究分析,探讨了层内非均质性类型及其特征。研究表明该区层内非均质类型共有箱型、钟型、漏斗型、中间突变型和复合型等五种。沙三沉积期不同微相非均质程度不同,席状砂、远砂坝、水下分流河道等微相属强非均质体,河口砂坝非均质程度弱,属最好储集层。     

延长油田郭旗西区长6储集条件及油气成藏控制因素分析

通过对延长油田郭旗西区长6油层组储层的沉积微相、储层的岩石学特征、成岩作用、孔隙结构特征和物性条件研究,探讨了影响储集条件和油气成藏的主要因素。延长油田郭旗西区三叠系延长组长6早期沉积微相以三角洲前缘水下分流河道为主,长6晚期以三角洲平原分流河道沉积为主,储集层发育。受成岩后生作用影响,形成了低孔隙度、特低—超低渗透率的储集层。油藏分布主要受沉积微相和储层物性控制,为典型的岩性油藏。