渤海湾盆地渤南洼陷沙三下亚段泥页岩非均质性特征及演化模式——以罗69井为例  

Heterogeneity and evolution model of the Lower Shahejie Member 3 mud-shale in the Bonan Subsag,Bohai Bay Basin:An example from Well Luo 69

作　　者：彭丽[1,2] 陆永潮[1,2] 彭鹏 刘惠民[4] 刘占红[1,2] 杜学斌[1,2] 李吉君 张三盛 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国地质大学(武汉)海洋学院,湖北武汉430074 [3]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452 [4]中国石化胜利油田分公司地质科学研究院,山东东营257015 [5]中国石油大学(华东)非常规油气与新能源研究院,山东青岛266580 [6]中国石油国际投资(加拿大)公司

出　　处：《石油与天然气地质》2017年第2期219-229,共11页Oil & Gas Geology

基　　金：国家重点基础研究发展计划(973计划)项目(2014CB239102)

摘　　要：通过岩心观察和样品测试数据综合分析,在总结前人层序格架研究成果的基础上,对渤海湾盆地济阳坳陷渤南洼陷古近系沙河街组三段下亚段湖相泥页岩的多重非均质性特征和演化规律进行研究。结果表明:沙三下亚段为一个三级层序,层序内可识别出湖扩体系域(EST)、早期高位体系域(EHST)和晚期高位体系域(LHST)。岩相组合、矿物组成、藻类化石、有机碳含量和有机质类型都在沙三下亚段层序格架内发生明显的规律性变化。其中,岩相组合方面共识别出6种岩相类型,各岩相的矿物组成从EST到LHST,粘土矿物、石英和长石含量增加,方解石和白云石含量减少,黄铁矿含量在EHST最高。藻类化石在LHST种类及丰度最为发育,有机碳含量在EST最低,有机质类型以Ⅰ型和Ⅱ1型为主。沙三下亚段泥页岩含油性受多重非均质性特征综合影响,对比分析认为EHST含油性最好,同时也是最具潜力的页岩油目的层段。Multiple heterogeneity characteristics and evolutionary process of the Lower member 3 of Paleogene Shahejie Formation lacustrine shale in the Bonan Subsag,Jiyang Depression have been analyzed based on previous sequence stratigraphic framework and analysis of core observation and sample testing. The results show that the Lower Es^3（ 下）can be described as a third-order sequence,which can be divided into expanding systems tract（ EST）,early highstand systems tract（ EHST） and late highstand systems tract（ LHST）. Lithofacies associations,mineralogy,algae species occurrence,as well as TOC（ total organic carbon） and kerogen type,change noticeably and regularly in the Lower Es3 shale within the sequence stratigraphic framework. For lithofacies associations,six lithofacies are identified. From the EST to the LHST,there are increased abundance in clay minerals,quartz and feldspar,and reduced abundance in calcite and dolomite,while pyrite reached the highest abundance in EHST. Algaes have the largest number and most variety of species in theLHST. TOC content is the lowest in the EST. Kerogen type is dominated by type Ⅰ and Ⅱ1. The oil richness is influenced by multiple heterogeneity characteristics,comparative analysis suggests the EHST is the most potential shale oil target interval in the study area with excellent oil richness.

关 键 词：非均质性 演化模式 泥页岩 沙河街组三段下亚段 渤南洼陷 渤海湾盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]