鄂爾多斯盆地安邊—新安邊地區(qū)長6油層組成藏特征研究
發(fā)布時間：2018-12-15 18:26
【摘要】：安邊-新安邊地區(qū)位于鄂爾多斯盆地次級構造單元伊陜斜坡的中西部,長6油層組是該區(qū)主要的勘探層位,目前已發(fā)現許多規(guī)模油藏,但研究區(qū)不同區(qū)塊不同層位上油氣富集差異明顯。本論文在充分吸收前人研究成果的基礎上,以石油地質學、現代油氣成藏理論為基礎,綜合應用大量分析化驗資料來分析研究區(qū)油氣成藏條件和油氣富集差異原因,建立成藏模式,總結油氣成藏主控因素,為研究區(qū)下一步的油氣勘探與開發(fā)提供良好的導向。 本文應用儲層地質學、沉積巖石學和測井地質學的理論和方法對研究區(qū)的儲層特征和砂體展布特征進行了系統(tǒng)的分析和研究。結果表明：研究區(qū)長6巖石類型主要為灰色細粒長石砂巖和巖屑長石砂巖,儲集空間以粒間孔和長石溶孔為主,此外發(fā)育有少量裂縫。長6孔隙度主要分布在6～18%范圍,滲透率主體分布在小于0.1～3×10-3μm2范圍,縱向上長63的物性最差,長62次之,長61的物性最好；平面上安邊地區(qū)的物性好于新安邊地區(qū)。長61砂體最發(fā)育,厚度較大,沿物源方向砂體橫向穩(wěn)定性好；其次是長62,規(guī)模較長61小,存在多套砂體疊置,在部分區(qū)域也具有一定的連通性；長63規(guī)模最小,橫向連通性最差。 現今勘探成果表明新安邊地區(qū)在長61、長62和長63原油均較富集,而安邊地區(qū)僅在長61較富集,長62和長63基本無顯示。通過油源對比指出研究區(qū)長6原油主要來自于下伏長7烴源巖的供給,長6自身泥巖供烴的貢獻有限；通過長7泥巖分布圖得出長7泥巖在新安邊地區(qū)較發(fā)育,而在安邊地區(qū)不發(fā)育；油氣成藏的動力主要為泥巖欠壓實作用產生的異常高壓和生烴增壓；裂縫在新安邊地區(qū)較發(fā)育,而在安邊地區(qū)不發(fā)育。綜上得出新安邊地區(qū)成藏為下伏長7烴源巖產物垂向運移到長6儲層,裂縫是新安邊地區(qū)成藏的關鍵；安邊地區(qū)成藏是新安邊地區(qū)長61中的原油側向運移過去的,砂體連通性、物性和單斜構造是安邊地區(qū)成藏的關鍵。總結研究區(qū)油氣成藏的主控因素主要有以下幾方面：烴源巖分布、裂縫分布、儲層物性、砂體展布和單斜構造。
[Abstract]:The Anbian-Xin 'anbian area is located in the central and western part of the Yishan slope of the secondary structural unit of the Ordos Basin. The Chang 6 oil formation is the main exploration horizon in this area. At present, many large reservoirs have been discovered. But there are obvious differences in hydrocarbon enrichment between different formations in different blocks in the study area. Based on petroleum geology and modern oil and gas accumulation theory, this paper uses a large amount of analytical and laboratory data to analyze the conditions of oil and gas accumulation and the reasons for the difference of oil and gas accumulation in the study area, on the basis of fully absorbing the previous research results and based on the theory of petroleum geology and modern oil and gas accumulation. The model of oil and gas reservoir formation is established and the main controlling factors of oil and gas accumulation are summarized, which provides a good guide for the further exploration and development of oil and gas in the study area. Based on the theories and methods of reservoir geology, sedimentary petrology and logging geology, this paper makes a systematic analysis and study on the reservoir characteristics and the distribution characteristics of sand bodies in the study area. The results show that the main rock types of Chang 6 in the study area are gray fine-grained feldspar sandstone and lithic feldspar sandstone with intergranular pore and feldspar dissolution pore as the main reservoir space and a small number of fractures. The porosity of Chang 6 is mainly distributed in the range of 6 ~ 18%, the main distribution of permeability is in the range of less than 0.1 脳 10 ~ (-3) 渭 m ~ (2), the physical property of longitudinal length 63 is the worst, Chang62 is the second, and Chang61 is the best. The physical properties of Anbian area on the plane are better than that of Xinanbian area. Chang 61 sand body is the most developed, the thickness is large, the transverse stability of sand body is good along the direction of material source, the second is long 62, the scale is longer 61 small, there are many sets of sand bodies overlay, also have certain connectivity in some areas. The length of 63 is the smallest, and the horizontal connectivity is the worst. The present exploration results show that Chang61, Chang62 and Chang63 are enriched in Xinanbian area, but only in Chang61, Chang62 and Chang63 in Anbian area. The oil source correlation indicates that Chang 6 crude oil in the study area mainly comes from the supply of source rock of Lower potential Chang 7, and the contribution of mudstone of Chang 6 itself is limited. According to the distribution map of Chang7 mudstone, Chang7 mudstone is relatively developed in Xinanbian area, but not developed in Anbian area, the main motive force of oil and gas accumulation is abnormal high pressure and hydrocarbon generating pressure caused by undercompaction of mudstone. The cracks are relatively developed in Xinanbian area, but not in Anbian area. It is concluded that the reservoir formation in Xinanbian area is the vertical migration of hydrocarbon products from source rock of Lower potential Chang 7 to Chang 6 reservoir, and the fracture is the key to reservoir formation in Xinanbian area. The reservoir formation in Anbian area is the lateral migration of Chang61 crude oil in Xinanbian area. Sand connectivity, physical property and monoclinic structure are the key factors for reservoir formation in Anbian area. The main controlling factors of hydrocarbon accumulation in the study area are summarized as follows: distribution of source rocks, distribution of fractures, reservoir physical properties, distribution of sand bodies and monoclinic structures.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13
本文編號：2381090
[Abstract]:The Anbian-Xin 'anbian area is located in the central and western part of the Yishan slope of the secondary structural unit of the Ordos Basin. The Chang 6 oil formation is the main exploration horizon in this area. At present, many large reservoirs have been discovered. But there are obvious differences in hydrocarbon enrichment between different formations in different blocks in the study area. Based on petroleum geology and modern oil and gas accumulation theory, this paper uses a large amount of analytical and laboratory data to analyze the conditions of oil and gas accumulation and the reasons for the difference of oil and gas accumulation in the study area, on the basis of fully absorbing the previous research results and based on the theory of petroleum geology and modern oil and gas accumulation. The model of oil and gas reservoir formation is established and the main controlling factors of oil and gas accumulation are summarized, which provides a good guide for the further exploration and development of oil and gas in the study area. Based on the theories and methods of reservoir geology, sedimentary petrology and logging geology, this paper makes a systematic analysis and study on the reservoir characteristics and the distribution characteristics of sand bodies in the study area. The results show that the main rock types of Chang 6 in the study area are gray fine-grained feldspar sandstone and lithic feldspar sandstone with intergranular pore and feldspar dissolution pore as the main reservoir space and a small number of fractures. The porosity of Chang 6 is mainly distributed in the range of 6 ~ 18%, the main distribution of permeability is in the range of less than 0.1 脳 10 ~ (-3) 渭 m ~ (2), the physical property of longitudinal length 63 is the worst, Chang62 is the second, and Chang61 is the best. The physical properties of Anbian area on the plane are better than that of Xinanbian area. Chang 61 sand body is the most developed, the thickness is large, the transverse stability of sand body is good along the direction of material source, the second is long 62, the scale is longer 61 small, there are many sets of sand bodies overlay, also have certain connectivity in some areas. The length of 63 is the smallest, and the horizontal connectivity is the worst. The present exploration results show that Chang61, Chang62 and Chang63 are enriched in Xinanbian area, but only in Chang61, Chang62 and Chang63 in Anbian area. The oil source correlation indicates that Chang 6 crude oil in the study area mainly comes from the supply of source rock of Lower potential Chang 7, and the contribution of mudstone of Chang 6 itself is limited. According to the distribution map of Chang7 mudstone, Chang7 mudstone is relatively developed in Xinanbian area, but not developed in Anbian area, the main motive force of oil and gas accumulation is abnormal high pressure and hydrocarbon generating pressure caused by undercompaction of mudstone. The cracks are relatively developed in Xinanbian area, but not in Anbian area. It is concluded that the reservoir formation in Xinanbian area is the vertical migration of hydrocarbon products from source rock of Lower potential Chang 7 to Chang 6 reservoir, and the fracture is the key to reservoir formation in Xinanbian area. The reservoir formation in Anbian area is the lateral migration of Chang61 crude oil in Xinanbian area. Sand connectivity, physical property and monoclinic structure are the key factors for reservoir formation in Anbian area. The main controlling factors of hydrocarbon accumulation in the study area are summarized as follows: distribution of source rocks, distribution of fractures, reservoir physical properties, distribution of sand bodies and monoclinic structures.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13
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