Response of Geology and Geochemistry to Adjustment and Reconstruction of the Jurassic Reservoirs in the Central Part of Junggar Basin
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摘要: 准噶尔盆地中部侏罗系油气成藏经历了多源、多期充注和晚期的调整改造.综合运用地质、测井和油藏地球化学等资料, 分析了油气藏经历晚期调整改造后的地质、地球化学响应特征.结果表明: 位于车-莫古隆起北翼的莫西庄、沙窝地地区, 经历反向调整后, 油气藏呈分散和小规模分布, 油气藏类型由以构造-岩性油气藏为主变成以地层/岩性油气藏为主, 且油气水层关系复杂; 油层低孔、低渗, 且低含油饱和度、低电阻率, 原油密度和粘度大; 今油水界面高于古油水界面, 部分水层中含有较高的"非烃+沥青质"; 而位于车-莫古隆起北翼的永进地区, 经历同向调整后, 今油柱高于古油柱, 油气藏规模变大.Abstract: Junggar basin is a large superposed basin in West China that experienced multi-stage tectonics. Preliminary study indicated that Jurassic reservoirs in the central part of Junggar basin experienced multi-stage hydrocarbon filling from multiple sources and late adjustment and reconstruction. The geologic and geochemical character of the Jurassic reservoir was investigated by integrating data of geology, drilling and geochemistry. The result indicates that reservoirs after reversing adjustment in Shawodi and Moxizhuang blocks located in the north limb of Che-Mo paleo-uplift are usually scattered in a small scale and their type is usually transforming from structural reservoir into stratigraphic/lithologic hydrocarbon reservoir, and have extremely complex oil-water contact or gas-water contact, low porosity and permeability, low oil saturation and resistivity, but heavier oil density and greater viscosity; the paleo oil-gas-water contact determined by grain-containing-oil inclusion (GOI) analysis is lower than the present, and there is a high content of soluble organic matters (i.e. non-hydrocarbon and asphaltine) in present water layers. However, the reservoir which experienced synthetic adjustment in Yongjin block located in the south limb of Che-Mo paleo-uplift has higher paleo oil-water contact verified by GOI value than the present, and paleo oil column is lower than the present. It means that the reservoir scale is expanding.
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图 1 准噶尔盆地构造单元划分与井位分布
Fig. 1. Sketch map showing the main structural elements of the Junggar basin and the location of the wells
图 2 莫西庄、征沙村地区侏罗系油藏岩心含油饱和度与孔隙度(a)和渗透率(b)关系
Fig. 2. Variation of measured oil saturation with porosity (a) and permeability (b) of reservoir rocks in the Moxizhuang and Zhengshachun blocks, Junggar basin
图 4 储层岩石学照片
a, b.zh3井，J1s21，4 160.50 m，褐灰色油斑粗砂岩；石英颗粒内裂纹和石英颗粒次生加大边“粘土迹”中见发蓝白色和黄色荧光油包裹体，而石英颗粒次生加大边中未见烃类包裹体(a为透射光，b为荧光；×100)；c.zh106井，J1s22，4 339.00 m，黄灰色油浸中砂岩；d.粒间见大量黄褐色油浸染(透射光，×100)
Fig. 4. Photographs showing the properties of reservoir petrology
图 5 三工河组油、水层中储层岩心氯仿沥青“A”与“非烃+沥青质”含量关系
Fig. 5. Relationship of content between chloroform bitumen A and soluble organic matters (i.e. non-hydrocarbon and asphaltine) extracting from core samples of different level oil-bearing rocks of Sangonghe Formation
图 6 Zh101井三工河组油层古、今油水界面划分
Fig. 6. Partitions of paleo and present oil-water contact in Sangonghe Formation for well Zh101
图 7 Y1井西山窑组油层古、今油水界面识别
Fig. 7. Partitions of paleo and present oil-water contact in Xishanyao Formation for well Y1
表 1 不同级别油、水层中储层岩心样品抽提物族组分平均值
Table 1. Average of extracts from core samples of different level oil-bearing rocks
含油性 样品数 饱和烃(%) 芳烃(%) 非烃(%) 沥青质(%) 非烃+沥青质(%) 氯仿沥青“A”(mg/g) 干层 18 66.92 12.07 11.58 7.45 19.26 2.97 油层 23 60.60 14.66 13.20 9.14 22.34 8.40 含水油层 15 56.34 17.98 15.62 8.70 24.32 6.27 油水同层 38 64.18 16.31 13.14 6.05 19.16 4.75 含油水层 8 60.32 16.60 14.36 8.48 22.83 7.24 水层 70 43.53 14.13 17.00 24.70 41.69 2.88 
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