Hydrocarbon Accumulation Characteristics of Upper Wuerhe Formation in Well Block K82, Karamay Oilfield
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摘要:
中拐凸起二叠系上乌尔禾组是继三叠系百口泉组之后发现的一个大型连续型砂砾岩油气藏群，但其北部区域油气成藏特征研究较少且成藏模式认识不清。笔者通过岩心观察、铸体薄片、测井和录井分析等资料，结合区域构造背景与沉积环境，对中拐凸起北部K82井区油气成藏特征进行综合分析，得出以下结论：K82井区主要发育扇三角洲平原和滨浅湖沉积亚相，大面积的分流河道砂砾岩、河道间及滨浅湖细砾沉积物构成良好的储盖组合，物性显示研究区上乌尔禾组为中-低孔低渗砂砾岩储层；以二叠系风城组为主的多套烃源岩为上乌尔禾组油气藏提供充足的油源供给；形成于华力西—燕山期的断裂和上下地层不整合面成为研究区上乌尔禾组油气疏导体系，油藏为下生上储断层-岩性型成藏模式。该结论为克拉玛依油田上乌尔禾组油气进一步勘探开发提供科学依据。
Abstract:The permian system upper Wuerhe formation of Zhongguai bulge is a large continuous conglomerate oil and gas reservoir group found after the triassic system Baikouquan formation., there are few studies on hydrocarbon accumulation characteristics in the northern part of the region, and the understanding of hydrocarbon accumulation patterns is unclear.Based on the data of core observation, cast thin section, well logging and log analysis, combined with the regional structural background and sedimentary environment, the characteristics of hydrocarbon accumulation in well block K82 north of Zhongguai bulge are comprehensively analyzed. Those studies have drawn the following conclusions: The well block K82 mainly develops fan-delta plain and shallow lakeside sedimentary subphase, with large area of divergent river channel sand and conglomerate, inter-channel and shallow lakeside fine gravel sediments forming a good reservoir-cover combination, the physical properties shown that the upper Wuerhe formation in the study area is a medium-low-hole and low-permeability conglomerate reservoir; Multiple sets of hydrocarbon source rocks, mainly from the permian Fengcheng formation, provide sufficient oil supply for the upper Wuerhe formation reservoir; Fractures and upper and lower stratigraphic unconformities formed in the Hercynian- Yanshanian period have become the oil and gas transportation system of the upper Wuerhe formation in the study area, and the oil reservoir is the source rock below, reservoir above and fault-lithology-type reservoir formation patterns.The conclusion provides scientific basis for further exploration and development of oil and gas in the upper Wuerhe formation of the Karamay oilfield.
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图 2 中拐凸起上乌尔禾组砂体及沉积相展布特征图（据邹妞妞等，2021修改）
Figure 2. Distribution characteristics of sand bodies and sedimentary facies of upper Wuerhe formation in Zhongguai uplift
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图 3 K82井3 402～3 662 m井段岩心综合地层柱状图
Figure 3. Comprehensive stratigraphic histogram of 3 402～3 662 m well section core of K82 well
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图 4 K82井区上乌尔禾组主要储集岩特征和储集空间类型图
a. K82井，3 650.28 m，浅灰色中砾岩；b. K304井，3 675.64 m，灰黑色含中砾小砾岩；c. K303井，3 785.53 m，灰褐色含粗砾中砾岩；d. K82井，3 507.85 m，灰色小砾岩；e. K303井，3 676.31 m，灰色含中砾小砾岩；f. K304井，3 601.32 m，灰色粗砂岩水平层理；g. K304井，3 666.38 m，剩余粒间孔，原生粒间孔，砂砾岩，铸体；h. K303井，3 757.83 m，剩余粒间孔，砂砾岩，铸体；i. K82井，3 507.75 m，微裂缝，砂砾岩，铸体
Figure 4. Reservoir characteristics and reservoir interspace types of upper Wuerhe Formation in K82 Well block
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图 5 K82井区上乌尔禾组孔−渗特征图
Figure 5. The porosity-permeability of upper Wuerhe formation of permian in K82 well block
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图 6 K82及邻区上乌尔禾组砂体连井剖面图
Figure 6. The sand bodies profile of upper Wuerhe formation in K82 and adjacent well block
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图 7 中拐凸起上乌尔禾组顶面构造图（a据黄立良等, 2022修）
Figure 7. Top surface structural map of upper Wuerhe formation in Zhongguai uplift
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图 8 中拐凸起上乌尔禾组成藏模式图
Figure 8. Hydrocarbon accumulation pattern of upper Wuerhe formation in Zhongguai uplift
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图 9 K82井区及邻区上乌尔禾组油气藏剖面图
Figure 9. Reservoir section of upper Wuerhe formation in the K82 and adjacent well block
表 1 K82和K79井区逆断裂要素
Table 1 The elements of reverse faults of P3w in in the K82 and K79 well block
序号 断裂名称 断裂性质 断开层位 断裂产状 断距 延伸长度 走向 倾向 倾角（°） （m） （km） 1 K009井北断裂 逆 P NW NE 75～85 5～10 5.55 2 K82井西断裂 逆 P S E 40～60 5～10 6.7 3 K302井南断裂 逆 P NW S 75～85 5～20 7.17 4 K218井北断裂 逆 P NW NE 60～80 5～15 6.88 5 K79井西断裂 逆 P S E 45～60 5～15 8.55 6 K79井北断裂 逆 P NW S 75～85 5～10 2.04 7 K79井南断裂 逆 P NW N 75～85 5～10 1.53 8 K301井西断裂 逆 P S E 20～70 5～20 8.62 9 K208井南断裂 逆 P NW S 75～85 5～25 16.19 
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