四川盆地广安地区须家河组石油地质特征研究

发布时间：2018-06-24 07:35

  本文选题：广安地区 + 须家河组　； 参考：《西南石油大学》2015年硕士论文

【摘要】：广安地区须家河组大面积含气,但呈“斑点状”分布格局；整体上遵循“上气下水”的规律；对于整个川中来说仅广安地区存在唯—的纯气顶,且位于广安2井区,其它地区均气水同产。本文以石油地质学和油气地球化学理论为指导,在综合分析广安地区须家河组气藏的测井、测试以及实验分析等资料的基础上,归纳总结研究区须家河组构造、沉积、地层以及气水分布特征,继而对研究区须家河组的石油地质特征及其与气水分布的关系进行了深入研究。 研究区须家河组存在须—、须三和须五段三套烃源岩,平面上分布稳定,厚度变化不大。不同层段烃源岩厚度及其生烃特征存在差异,其中须五段烃源岩在研究区沉积厚度最大,须三段和须—段源岩次之；有机质丰度也以须五段最高,须五、须三和须—段烃源岩有机碳含量平均值分别为1.66%、1.13%和1.21%,氯仿沥青“A”含量分别为0.631%、0.239%和0.109%,不同层段源岩均达到了好的烃源岩的标准,有机质类型均为Ⅲ型,处于成熟阶段晚期至高成熟早期阶段,烃源岩整体上生烃强度—般。 研究区储层主要分布在须四和须六段。须六段储层以岩屑砂岩和长石岩屑砂岩为主,须四段储层以长石岩屑砂岩及岩屑石英砂岩为主；须六段储层储集空间类型主要为粒间溶孔、原生粒间孔和粒内溶孔,须四段储层储集空间类型主要为粒间溶孔、粒内溶孔两种类型,且发育少量低角度的裂缝。须六段和须四段储层孔喉细小,孔渗均较差,非均质性较强,整体上属于低孔低渗-特低渗的致密砂岩。 川中广安地区须家河组须六段和须四段天然气甲烷、重烃气含量以及干燥系数差别明显：须六段天然气甲烷含量平均值为89.36%,须四段为92.66%；须六段天然气重烃含量平均值为9.94%,须四段为6.61%；须六段天然气干燥系数(C1/C1+)平均值为0.91,须四段为0.94。而且须四段的天然气甲、乙烷碳同位素都明显重于须六段,说明广安地区须四和须六段气源分别来自下伏的须三和须五段,属于典型的近源成藏。 烃源岩、储层、构造都对研究区气水分布具有—定的影响。宏观上,构造控制着“上气下水”的分布格局,但气藏内部,这三个因素共同起作用,造成了该区须家河组气水分布复杂的格局。
[Abstract]:The Xujiahe formation in Guang'an area contains gas in a large area, but it has a "spot" distribution pattern, and follows the law of "upper gas drainage" as a whole. For the whole central Sichuan area, there is only a pure gas cap in Guang'an area, and it is located in Guangan 2 well area. Gas and water are common in other areas. Guided by petroleum geology and oil and gas geochemistry theory, based on the comprehensive analysis of logging, testing and experimental analysis of Xujiahe formation gas reservoir in Guangan area, this paper summarizes and summarizes the structure and deposition of Xujiahe formation in the study area. The stratigraphic and gas-water distribution characteristics of Xujiahe formation and its relationship with gas-water distribution in the study area were studied. There are three sets of hydrocarbon source rocks in Xujiahe formation, Xujiahe formation and Xujiahe formation. The thickness and hydrocarbon generation characteristics of source rocks in different formations are different, among which the source rocks of the fifth member are the largest in the study area, followed by the source rocks of the third member and the Xuzhou formation, and the abundance of organic matter is the highest in the fifth member of the formation. The average organic carbon content of source rocks in Xuanhe formation is 1.66% and 1.21%, respectively, and the content of chloroform bitumen "A" is 0.631U 0.239% and 0.109%, respectively. The source rocks of different formations have reached the standard of good source rocks, and the organic matter types are all of type 鈪，

本文编号：2060630