吉木萨尔凹陷二叠系芦草沟组致密油源储特征新认识  

GEOLOGICAL CHARACTERISTICS OF SOURCE ROCK AND RESERVOIR OF TIGHT OIL AND ITS ACCUMULATION MECHANISAM:A CASE STUDY OF PERMIAN LUCAOGOU FORMATION IN JIMUSAR SAG,JUNGGARBASIN

作　　者：王屿涛[1] 杨召 张国清[1] 潘长春[3] 汪飞[1] 向英[1] 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000 [3]中国科学院广州地球化学研究所,广东广州510000

出　　处：《新疆石油天然气》2017年第4期1-6,18,共7页Xinjiang Oil & Gas

摘　　要：针对吉木萨尔凹陷二叠系芦草沟组致密油特有的源储特性,对比了国内外典型致密油藏的源储条件和油藏特征;通过烃源岩模拟实验和储层岩石学物理实验,揭示了低成熟重质致密油的成因和致密油储层的脆性属性。对比结果表明,吉木萨尔凹陷致密油无论在烃源条件、储层岩石脆性属性还是在原油性质以及油藏特征方面与美国巴肯和我国鄂尔多斯盆地致密油相比均不及前者,总体上成藏条件较差;芦草沟组烃源岩生烃动力学模拟实验证实了早期低成熟阶段(Ro<0.8%)大量生排烃并大规模成藏是原生低熟重质致密油形成的主要成因;吉174井芦草沟组岩石物理学模拟试验结果结合测井岩性解释厚度表明,脆性较好的砂屑云岩、云质砂岩等仅占15.17%,脆性中等的泥晶云岩、长石岩屑砂岩占12.45,脆性较差的富有机质云泥岩、泥岩占到72.38%。因此,总体评价为芦草沟组致密储层岩石脆性较差。这些特性决定了吉木萨尔凹陷致密油资源品位总体较低。In order to research on the peculiar geological characteristcs of source rock and reservoir of tight oilin Permian Lucaogou formation of Jimusaer Sag, the typical geological conditions of source rock and reservoirand reservoir characteristics of tight oil at home and abroad are compared in this paper. The simulation experi-ment of source rock and physical experiment of reservoir petrology are conducted, which reveals the origin of low-mature tight oil and brittleness of reservoir of tight oil. And the comparison result shows that compared with thetight oil of Bakken in America and Erdos Basin in our country, the hydrocarbon source condition, reservoir rockbrittleness, crude oil properties and oil reservoir features of the tight oil in Jimusaer Sag are not as good as thefirst mentioned of two, the accumulation conditions of it are poor on the whole. The hydrocarbon generation kinet-ics simulation experiment of source rock in Lucaogou formation proves that the mass generation and expulsion ofhydrocarbons and large-scale hydrocarbon accumulation at early low-mature stage(Ro<0.8%) are the main con-tributing factors of primary low-mature tight oil. The simulation test results of petrophysics of Lucaogou forma-tion in Well Ji-174 and lithology interpretation of well logging show that among the tight oil reservoir rocks, dola-renite and dolomitic sandstone with good brittleness accounts for 15.17% of the total, dolomicrite and feldsparlithic sandstone with medium degree of brittleness accounts for 12.45% of the total, while dolomitic mudstonewith rich organic matters and mudstone which have poor brittleness accounts for 72.38% of the total. That'whythe overall evaluation of the brittleness of the rocks in tight oil reservoir of Lucaogou formation is poor. And theseproperties determine low-grade of tight oil in Jimusaer Sag.

关 键 词：致密油 资源品位 低成熟 成因 脆性评价 吉木萨尔凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]