江汉盆地潜江凹陷致密油藏特征及成因  

Tight Oil Reservoir in Qianjiang Sag of Jianghan Basin: Characterstics and Origin

作　　者：宋换新[1] 陈波[1] 沈均均[1] 陈立欣[2] 

机构地区：[1]长江大学非常规油气湖北省协同创新中心,武汉430100 [2]中国石化江汉油田分公司江汉采油厂,湖北潜江433123

出　　处：《新疆石油地质》2015年第2期174-179,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05004-001-004)

摘　　要：潜江凹陷新沟地区始新统新沟嘴组下段Ⅱ油组白云岩储集层致密油藏研究程度低。在分析油藏基本石油地质特征的基础上,利用原油及烃源岩样品分析资料,对原油地化特征、油源及其成因进行了研究。结果表明,新沟嘴组下段Ⅱ油组湖相白云岩储集层为中-低孔、超低渗透、特小孔喉致密储集层,油藏具有典型致密油藏特征。Ⅱ油组泥质烃源岩有机质丰度高,热演化程度低,具有较大的生成低熟油的潜力。生物标志化合物特征分析表明,Ⅱ油组原油成熟度低,为典型的咸水湖相低熟油。原油来源于同层系构造低部位低熟烃源岩,为自生自储油藏,存在短距离的二次运移。新沟嘴组下段Ⅱ油组低熟油生烃母质为高等植物、浮游生物和藻类等为主的咸水湖相混合型有机质,生物类脂物早期生烃为研究区低熟油的主要生烃模式,而富硫大分子早期降解生烃也可能是其重要的生烃模式。The dolomite tight reservoir of Ⅱ oil layer of Xingouzui formation （Exl-Ⅱ） in Xingou area of Qianjiang sag is in low degree of ex- ploration and research. This paper studied the crude oil geochemistry, oil source and genetic type in this reservoir, based on analysis data of the oil and hydrocarbon source rocks samples. The results show that the dolomite reservoir of Exl-Ⅱ is of typical feature of tight oil res- ervoir, which is medium-low porosity, ultra-low permeability and super-small throat, and stronger potential of generating low-mature oil with high organic abundance and low thermal evolution of the muddy source rocks. The characteristics of the biomarkers indicate that the low-mature oil belongs to typical one from the saline lacustrine mudstone in source rocks of structural low, with both source and reservoir and short secondary migration. The parent materials of the oils are dominated by mixed types of organic matters including terrestrial high- er plants, plankton and algae, etc. The early hydrocarbon generation of biological lipid is the main hydrocarbon-generating model for low- mature oils in this area, while early degradation of sulfur-rich macromolecular could be its one of important models for hydrocarbon generation.

关 键 词：江汉盆地 潜江凹陷 新沟地区 致密油藏 白云岩 低熟油 油源对比 成因类型 

分 类 号：TE112.41[石油与天然气工程—油气勘探]