本文選題：廣安地區(qū) + 須家河組　； 參考：《西南石油大學》2015年碩士論文

【摘要】：廣安地區(qū)須家河組大面積含氣,但呈“斑點狀”分布格局；整體上遵循“上氣下水”的規(guī)律；對于整個川中來說僅廣安地區(qū)存在唯—的純氣頂,且位于廣安2井區(qū),其它地區(qū)均氣水同產。本文以石油地質學和油氣地球化學理論為指導,在綜合分析廣安地區(qū)須家河組氣藏的測井、測試以及實驗分析等資料的基礎上,歸納總結研究區(qū)須家河組構造、沉積、地層以及氣水分布特征,繼而對研究區(qū)須家河組的石油地質特征及其與氣水分布的關系進行了深入研究。 研究區(qū)須家河組存在須—、須三和須五段三套烴源巖,平面上分布穩(wěn)定,厚度變化不大。不同層段烴源巖厚度及其生烴特征存在差異,其中須五段烴源巖在研究區(qū)沉積厚度最大,須三段和須—段源巖次之；有機質豐度也以須五段最高,須五、須三和須—段烴源巖有機碳含量平均值分別為1.66%、1.13%和1.21%,氯仿瀝青“A”含量分別為0.631%、0.239%和0.109%,不同層段源巖均達到了好的烴源巖的標準,有機質類型均為Ⅲ型,處于成熟階段晚期至高成熟早期階段,烴源巖整體上生烴強度—般。 研究區(qū)儲層主要分布在須四和須六段。須六段儲層以巖屑砂巖和長石巖屑砂巖為主,須四段儲層以長石巖屑砂巖及巖屑石英砂巖為主；須六段儲層儲集空間類型主要為粒間溶孔、原生粒間孔和粒內溶孔,須四段儲層儲集空間類型主要為粒間溶孔、粒內溶孔兩種類型,且發(fā)育少量低角度的裂縫。須六段和須四段儲層孔喉細小,孔滲均較差,非均質性較強,整體上屬于低孔低滲-特低滲的致密砂巖。 川中廣安地區(qū)須家河組須六段和須四段天然氣甲烷、重烴氣含量以及干燥系數差別明顯：須六段天然氣甲烷含量平均值為89.36%,須四段為92.66%；須六段天然氣重烴含量平均值為9.94%,須四段為6.61%；須六段天然氣干燥系數(C1/C1+)平均值為0.91,須四段為0.94。而且須四段的天然氣甲、乙烷碳同位素都明顯重于須六段,說明廣安地區(qū)須四和須六段氣源分別來自下伏的須三和須五段,屬于典型的近源成藏。 烴源巖、儲層、構造都對研究區(qū)氣水分布具有—定的影響。宏觀上,構造控制著“上氣下水”的分布格局,但氣藏內部,這三個因素共同起作用,造成了該區(qū)須家河組氣水分布復雜的格局。
[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，

本文編號：2060630