CAJ | 학술논문

湖相细粒沉积的研究对于页岩油气的勘探开发具有重要意义.以鄂尔多斯盆地下寺湾柳洛峪延长组长7油层组细粒沉积岩系为研究对象,在大量实验数据分析、单井岩心观察和测井微相分析的基础上,阐明了柳洛峪长7油层组沉积微相的发育特征,对陆相页岩气勘探前景进行了初步探讨.研究表明,下寺湾地区柳洛峪长7油层组主要发育三角洲—深湖—半深湖相沉积,页岩储层孔隙度范围为0.1%~13.14%,基质渗透率范围为0.003~1.49mD,总体为低孔隙度、低渗透率的特征.页岩有机质类型以Ⅰ型为主,其次为Ⅱ型,有机碳含量为0.51%~22.6%,镜质组反射率为0.7%~1.2%,处于成熟—高成熟演化阶段,具备页岩气生成的物质基础.泥页岩脆性矿物质量分数大于25%,有利于储层的后期改造.长7油层组泥页岩埋深适中,分布稳定,具有较好的勘探开发潜力.
호상세립침적적연구대우혈암유기적감탐개발구유중요의의.이악이다사분지하사만류락욕연장조장7유층조세립침적암계위연구대상,재대량실험수거분석、단정암심관찰화측정미상분석적기출상,천명료류락욕장7유층조침적미상적발육특정,대륙상혈암기감탐전경진행료초보탐토.연구표명,하사만지구류락욕장7유층조주요발육삼각주—심호—반심호상침적,혈암저층공극도범위위0.1%~13.14%,기질삼투솔범위위0.003~1.49mD,총체위저공극도、저삼투솔적특정.혈암유궤질류형이Ⅰ형위주,기차위Ⅱ형,유궤탄함량위0.51%~22.6%,경질조반사솔위0.7%~1.2%,처우성숙—고성숙연화계단,구비혈암기생성적물질기출.니혈암취성광물질량분수대우25%,유리우저층적후기개조.장7유층조니혈암매심괄중,분포은정,구유교호적감탐개발잠력.
Lacustrine fine grain deposition research is of great significance for shale oil and gas Exploration and develop-ment. Taking fine sedimentary rocks of Chang7 reservoir in Yanchang Formation of Liuluoyu Block in Xiasiwan Area of Or-dos Basin as research object, on the basis of a large number of experimental data, single-well core observation and logging microfacies analysis, we illuminated the development characters of sedimentary microfacies in the reservoir and preliminari-ly discussed the prospect of exploration for continental shale gas. . The results showed that the main facies in Chang7 reser-voir were delta-deep lake-half deep lake facies, the porosity of shale reservoir ranged from 0. 1% to 13. 14%, and the ma-trix permeability was between 0. 003mD and 1. 49mD. It featured in low porosity and low permeability in general. The or-ganic matter was dominated by Type Ⅰ and followed by Type Ⅱ. TOC was 0. 51%~22. 6%, and Ro was 0. 7%~1. 2%. The reservoir was at the stage of maturation and high-maturation.It laid material basis for shale gas generation. The brittle mineral accounted for more than 25%, which was beneficial to the later reconstruction in reservoir. The buried depth of Chang7 reservoir was moderate with stable distribution. It pos-sessed huge potential for exploration and development.