准中1区侏罗系三工河组低渗透储层特征与有效性评价

发布时间：2018-05-12 05:02

  本文选题：准中1区 + 三工河组　； 参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：准中1区主体位于准噶尔盆地腹部盆1井西凹陷,南部处于昌吉凹陷北斜坡,构造上为一南倾单斜坡,自北向南分布沙窝地、莫西庄和征沙村三个区块,断裂体系和正向构造不发育。研究层位侏罗系三工河组以发育大套稳定分布的三角洲前缘砂体为特征,是准中1区油气勘探主要目的层系,近期勘探成果显示了良好的油气勘探潜力,但由于储层特征不明确,多口探井在目的层钻遇干层或试油产液量变化幅度大,因此针对三工河组低渗透储层,系统开展储层特征研究,明确有效储层发育的控制因素及有效储层展布特征对于研究区油气勘探具有重要意义。因此,本论文综合运用岩心资料、测录井资料及铸体薄片鉴定、SEM及物性测试等分析化验资料,对研究区三工河组低渗透储层岩石学特征、成岩特征、储集特征、有效储层物性下限、有效储层控制因素及有效储层展布特征等进了系统性研究,取得了以下成果和认识:(1)准中1区三工河组低渗透储层岩性以细砂岩、中砂岩和粗砂岩为主,其次为粉砂岩,砾岩和砂砾岩含量较低,岩石成分类型主要为长石质岩屑砂岩;储层成岩演化程度低,主要处于中成岩A1亚期,压实作用中等-强,胶结作用多样,以高岭石胶结发育普遍,对储层低渗具有重要影响,溶解作用普遍较弱,发育弱压实弱溶解弱胶结成岩相、中压实弱溶解弱胶结成岩相、中压实弱溶解高岭石中强胶结成岩相等8种主要的成岩相类型;储层物性主要显示低孔低渗特征,储集空间以原生孔为主,根据Pd和Pc50将储层孔喉结构划分为三大类六小类;由于构造位置和储层埋深的较大差异,沙窝地、莫西庄和征沙村三工河组储层压实强度、物性特征和孔喉结构特征差异明显。(2)综合利用分布函数曲线法、试油法、测试法等计算了三工河组有效储层渗透率下限,并以孔喉结构为约束,计算了不同孔喉结构类型储层孔隙度下限;以孔隙度差值和渗透率差值为主要参数,分析了三工河组有效储层主控因素,认为有效储层发育主要受岩相和成岩相控制,沉积微相和地层压力等因素对有效储层发育影响不大。(3)根据有效储层主控因素-岩相和成岩相的明显差异,并结合储层物性及试油资料等,对准中1区三工河组二段砂岩储层进行了分类评价,将其分为Ⅰ类、Ⅱ1类、Ⅱ2类、Ⅲ类和Ⅳ类,并根据岩相-成岩相测井识别成果,预测了各类有效储层平面展布特征,认为沙窝地和莫西庄北部地区1~4砂组主要为Ⅰ类储层发育区,5砂组主要发育Ⅱ2类储层;莫西庄地区1~4砂组主要为Ⅱ1类储层,5砂组发育Ⅲ类储层,征沙村地区则主要发育Ⅳ类储层;6砂组发育Ⅳ类储层。
[Abstract]:The main body of area 1 is located in the west sag of basin 1 in the abdomen of Junggar basin, and the north slope of Changji sag is located in the south. The structure is a single slope with a southern dip. The Shawo area distributes from north to south, and three blocks, Moxizhuang and Zhenshacun, are located. Fault systems and forward structures are not developed. The Sangonghe formation of Jurassic strata is characterized by the development of a large set of stable delta front sand bodies, which is the main target system for oil and gas exploration in area Qizhong 1. The recent exploration results show a good potential for oil and gas exploration. However, because of the unclear reservoir characteristics and the large variation of drilling dry layer or oil test fluid production in the target formation, the research on reservoir characteristics is carried out systematically for the low permeability reservoir of Sangonghe formation. It is important for oil and gas exploration to identify the controlling factors of effective reservoir development and the distribution characteristics of effective reservoir. Therefore, this paper synthetically uses core data, logging data, casting thin section identification, SEM and physical property test data to analyze the petrological characteristics, diagenetic characteristics and reservoir characteristics of low permeability reservoirs in Sangonghe formation, the study area. The lower limit of physical properties of effective reservoir, the controlling factors of effective reservoir and the distribution characteristics of effective reservoir have been systematically studied, and the following results and understandings have been obtained. The lithology of low permeability reservoirs of Sangonghe formation in quasi middle and first district is mainly composed of fine sandstone, medium sandstone and coarse sandstone. The second is siltstone, the content of conglomerate and sandy gravel is low, the rock composition type is mainly feldspathic lithic sandstone, the diagenetic evolution degree of reservoir is low, mainly in the A1 substage of middle diagenesis, the compaction is medium to strong, and the cementation is various. The kaolinite cementation is widely developed, which has an important influence on the low permeability of the reservoir. The dissolution is generally weak, the weak compaction is weak to form the lithofacies, and the medium compaction is weak to dissolve the weak glue to form the lithofacies. There are eight main diagenetic facies types of medium compacted weakly dissolved kaolinite and strong cemented rocks, the physical properties of reservoir mainly show low porosity and low permeability, and the reservoir space is dominated by primary pore. According to PD and Pc50, the pore throat structure of the reservoir is divided into three categories and six subclasses. Because of the great difference of structure location and reservoir buried depth, there are obvious differences in compaction strength, physical properties and pore throat structure characteristics between Shawodi, Moxizhuang and Zhenshacun Sangonghe formation reservoirs. The effective reservoir permeability limit of Sangonghe formation is calculated by the test method, and the lower limit of porosity of different pore throat structure types is calculated with pore throat structure as the constraint, and the porosity difference and permeability difference are taken as the main parameters. The main controlling factors of effective reservoir in Sangonghe formation are analyzed. It is considered that the development of effective reservoir is mainly controlled by lithofacies and diagenetic facies. The factors such as sedimentary microfacies and formation pressure have little influence on the development of effective reservoir. (3) according to the obvious differences between the main controlling factors of effective reservoir lithofacies and diagenetic facies, combined with reservoir physical properties and oil testing data, etc. The sandstone reservoirs of the second member of the Sangonghe formation in Zhong1 area are classified and evaluated, and they are classified into 鈪，

本文编号：1877215