廊固凹陷古近系沙河街组中深层储层特征研究
发布时间：2018-10-29 13:59
【摘要】：廊固凹陷是冀中凹陷最北部的含油气凹陷,勘探程度较高,目前主要的勘探对象为中深层的隐蔽性油气藏。然而中深层储层非均质性强,油气分布规律错综复杂,造成油气勘探难度增强、风险增加。本论文以油气储层地质学相关的基础理论为指导,运用岩心观察、薄片鉴定及图像分析、压汞资料、测录井资料、流体包裹体分析等技术手段,并结合前人的研究成果,对廊固凹陷古近系沙河街组储层(重点是沙三段、沙四上亚段深度大于2000m)储层特征进行了一定的研究,包括岩石学特征、物性特征、孔喉结构特征、储层空间展布情况、控制因素等。廊固凹陷古近系沙河街组中深层储层,岩石类型以长石砂岩、岩屑长石砂岩和长石质岩屑砂岩为主。碎屑成熟度为低成分成熟度,中等结构成熟度。储层孔隙间胶结物类型多、含量中等,碳酸盐矿物中以方解石胶结为主,自生黏土矿物以高岭石为主。不同构造带填隙物具体含量有所差异。研究区目的层孔隙度类型以中孔-低孔为主,渗透率类型以特低渗-超低渗居多。从构造带上看,柳泉—曹家务洼槽带储层物性相较另外两个构造带更好;从层位上比较,沙三段储层物性整体上好于沙四上亚段。整个凹陷沙河街组储层纵向上共发育有3个异常高孔带,深度分别为2400~2600m、2750~3250m和3800~4500m。根据已有的实测物性资料、测井资料、压汞测试资料综合研究,结合国内碎屑岩储层孔隙度和渗透率类型划分标准,将廊固凹陷古近系沙河街组中深层储层分为Ⅰ类、Ⅱ类(Ⅱa、Ⅱb)、Ⅲ类、Ⅳ类,储层物性依次变差。研究区沙四上亚段储层级别以Ⅲ类、Ⅳ类储层为主,沙三下亚段储层以Ⅱb、Ⅲ类储层为主,沙三中亚段储层以Ⅱb、Ⅲ类储层为主,也有少量Ⅰ类、Ⅱa类储层发育。优质储层主要发育在湖底扇相、辫状河三角洲前缘水下分流河道砂、滨浅湖滩坝砂体。廊固凹陷古近系沙河街组中深层储层发育受沉积因素、成岩作用、构造作用、烃类充注、异常高压等因素的共同控制。其中沉积作用控制砂体发育;成岩演化作用过程与储层孔隙演化存在耦合关系;构造作用下产生的裂缝改善了储层的运输通道,岩浆活动的烘烤叠加效应使生油门限上移,促使油气生成;早期烃类充注减缓了自生矿物的形成和矿物间的交代作用,并且抑制了晚期碳酸盐胶结物的充填,从而保护了原生孔隙,对储层物性演化起到积极作用;异常高压的发育主要保护和改造了储层物性。综合沉积因素、储层物性特征和目前的勘探进展对廊固凹陷沙三段、沙四上亚段中深层储层有利区带进行了预测。
[Abstract]:Langgu sag is the northernmost oil-bearing sag in Jizhong sag, which has a high exploration degree. At present, the main exploration object is the hidden oil and gas reservoir in the middle and deep layers. However, the heterogeneity of middle and deep reservoirs and the complexity of oil and gas distribution make the exploration of oil and gas more difficult and riskier. Guided by the basic theory of oil and gas reservoir geology, this paper uses core observation, thin slice identification and image analysis, mercury injection data, logging data, fluid inclusion analysis and other technical means, and combines the previous research results. The reservoir characteristics of the Paleogene Shahejie formation in the Langgu depression are studied, including petrology, physical properties, pore throat structure and reservoir spatial distribution. Control factors, etc. The middle and deep reservoirs of Shahejie formation of Paleogene in Langgu depression are mainly composed of feldspathic sandstone, lithic feldspathic sandstone and feldspathic lithic sandstone. The detrital maturity is low composition maturity and medium structure maturity. There are many types of interpore cementation and medium content in reservoir. Calcite cementation is dominant in carbonate minerals and kaolinite is dominant in authigenic clay. The specific contents of interstitial materials in different tectonic zones are different. In the study area, the porosity types of the target layer are mainly mesoporous and low porosity, while the permeability types are mainly ultralow permeability and ultra low permeability. From the structural belt, the reservoir physical properties of Liuquan-Cao Zaozhouwa trough belt are better than those of the other two structural zones, and the reservoir physical properties of the third member of Sha 3 are better than that of the upper submember of Sha 4 on the whole. There are three abnormal high porosity zones in the reservoir of Shahejie formation in the whole sag, the depth of which is 2400 ~ 2600m ~ 2750m ~ 3250m and 3800N ~ 4500m respectively. According to the existing physical property data, well logging data and mercury injection test data, combined with the classification standard of porosity and permeability of clastic rock reservoirs in China, the middle and deep reservoirs of Shahejie formation of Paleogene in Langgu depression are classified into class 鈪，
本文编号：2297891
[Abstract]:Langgu sag is the northernmost oil-bearing sag in Jizhong sag, which has a high exploration degree. At present, the main exploration object is the hidden oil and gas reservoir in the middle and deep layers. However, the heterogeneity of middle and deep reservoirs and the complexity of oil and gas distribution make the exploration of oil and gas more difficult and riskier. Guided by the basic theory of oil and gas reservoir geology, this paper uses core observation, thin slice identification and image analysis, mercury injection data, logging data, fluid inclusion analysis and other technical means, and combines the previous research results. The reservoir characteristics of the Paleogene Shahejie formation in the Langgu depression are studied, including petrology, physical properties, pore throat structure and reservoir spatial distribution. Control factors, etc. The middle and deep reservoirs of Shahejie formation of Paleogene in Langgu depression are mainly composed of feldspathic sandstone, lithic feldspathic sandstone and feldspathic lithic sandstone. The detrital maturity is low composition maturity and medium structure maturity. There are many types of interpore cementation and medium content in reservoir. Calcite cementation is dominant in carbonate minerals and kaolinite is dominant in authigenic clay. The specific contents of interstitial materials in different tectonic zones are different. In the study area, the porosity types of the target layer are mainly mesoporous and low porosity, while the permeability types are mainly ultralow permeability and ultra low permeability. From the structural belt, the reservoir physical properties of Liuquan-Cao Zaozhouwa trough belt are better than those of the other two structural zones, and the reservoir physical properties of the third member of Sha 3 are better than that of the upper submember of Sha 4 on the whole. There are three abnormal high porosity zones in the reservoir of Shahejie formation in the whole sag, the depth of which is 2400 ~ 2600m ~ 2750m ~ 3250m and 3800N ~ 4500m respectively. According to the existing physical property data, well logging data and mercury injection test data, combined with the classification standard of porosity and permeability of clastic rock reservoirs in China, the middle and deep reservoirs of Shahejie formation of Paleogene in Langgu depression are classified into class 鈪，
本文编号：2297891
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