Accumulation Characteristics and Charging Process of Heterogeneous Mixed Reservoir in Bozhong 26-6 Buried Hill Oilfield, Bohai Bay Basin
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摘要: 渤中26-6潜山油田位于渤海湾盆地渤中坳陷渤南低凸起西段,是继渤中19-6潜山凝析气田之后,渤海海域新发现的又一个亿吨级潜山油田,也是近年来中国近海取得的最大油气发现.为了解决该油田存在的成藏规律不清,特别是油气来源和成藏过程与模式尚不明确的问题,综合运用原油生物标志化合物、流体包裹体分析及烃源岩生烃模拟等方法进行了系统分析,取得以下几点创新性认识:(1)渤中26-6潜山油田原油与天然气具有异源特征,分别来自不同的凹陷,原油主要来源于黄河口凹陷沙三段,凝析气主要来自于渤中凹陷南次洼沙三段;(2)渤中26-6潜山油田明显经历了早期正常油(10~5 Ma)、中期凝析油气(5~0 Ma)、晚期轻质油(2.5~0 Ma)3期油气充注历程,中期与晚期流体充注规模较大,对渤中26-6油田的聚集成藏具有决定作用;(3)渤中凹陷南次洼与黄河口凹陷烃源岩生烃演化差异以及烃源岩与渤中26-6潜山接触关系的不同,造成渤中26-6不同区块成藏模式与流体相态的差异. 上述认识对丰富潜山油气成藏规律、指导类似潜山油气勘探具有重要意义.Abstract: Bozhong 26-6 Oilfield is located in the west section of Bonan Low Uplift, Bozhong Depression, Bohai Bay Basin.It is an another buried hill oil field newly discovered in Bohai Sea area with 100 million ton reserves after the exploration breakthrough of Bozhong 19-6 buried hill condensate gas field, is also the largest oil and gas discovery in China's offshore waters in recent years. In response to solve unclear reservoir formation laws in the research area, especially the unclear source and accumulation process of oil and gas, this paper comprehensively uses the methods of crude oil physical property analysis, biomarkers, inclusion Petrography, homogenization temperature-paleosalinity and hydrocarbon generation simulation of source rocks, a systematic analysis was conducted, the results have shown that: (1) Bozhong 26-6 structure has different oil and gas sources, the characteristics of biomarker compounds indicate that crude oil mainly comes from the third member of the Shahejie Formation in the Huanghekou sag, however, condensate gas mainly comes from the third member of the Shahejie Formation in the southern subsag of the Bozhong Depression; (2) The Bozhong 26-6 oilfield has gone through three stages of oil and gas injection: early normal mature crude oil, middle condensate oil and gas (natural gas), and late light oil, The large scale of fluid filling in the middle and late stages plays a decisive role in the formation of reservoirs in the Bozhong 26-6 oilfield; (3)There are differences in hydrocarbon generation evolution between the source rocks in the Small sub depression in the southern part of Bozhong Depression and the Huanghekou Depression, and the contact relationship between the source rocks and the Bozhong 26-6 buried hill is different.therefore, this leads to differences in reservoir formation patterns and fluid phase states between different blocks in Bozhong 26-6.The above understanding and inspiration are of great significance for enriching the rules of buried hill oil and gas accumulation and guiding oil and gas exploration.
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图 4 渤中26-6潜山油田及周边构造原油生标特征
a. BZ13-1S-A, 2 214.0 m,馆陶组,常规油样(代表渤中凹陷南次洼东营组来源的原油特征);b.BZ19-6-A, 4 043.4~4 142.0 m,太古界,凝析油样(代表渤中凹陷南次洼沙三段来源的原油特征);c.BZ26-5-A,4 224.0 m,太古界,壁心抽提样(代表黄河口凹陷沙三段来源的原油特征);d.BZ26-6-E,3 903.0 m,太古界,常规油样(渤中26-6潜山油田常规原油特征);e.BZ26-6-B,3 903.0 m,元古界,凝析油样(渤中26-6潜山油田凝析油特征)
Fig. 4. Characteristics of crude oil biomarkers in the Bozhong 26-6 buried hill oilfield and surrounding structures
图 6 渤中26-6潜山油田及周边构造天然气成因类型及其成熟度
成熟度计算公式:δ13C1=21.7lgRo-43.31,据沈平等(1991)
Fig. 6. Genetic Types and Maturity Identification of Natural Gas in Bozhong 26-6 Buried Hill Oilfield and Surrounding Sags
图 7 黄河口凹陷与渤中凹陷南次洼虚拟井热演化史模拟(井点位置见图 1)
a为渤中凹陷南次洼虚拟井A;b为黄河口凹陷虚拟井B;图据谢敏俊仕(2021),陈斌等(2006)
Fig. 7. Hydrocarbon generation history of virtual wells in Huanghekou Sag and Bozhong South Sub Sag(The location of the well point is shown in Fig. 1)
图 8 渤中26-6潜山油田储层流体包裹体单偏光与荧光照片
a,b. BZ26-6-K,3 875 m,沙一二段,原油包裹体,透射光下呈深褐色,紫外光激发呈暗褐色或褐黄色,沿石英颗粒微裂隙成带分布,其中a为单偏光,b为荧光;c,d. BZ26-6-A,3 139 m,太古界,凝析油气包裹体,透射光下呈灰色,紫外光激发呈蓝色,在石英颗粒内成岩裂纹中分布;其中c为单偏光,d为荧光;e,f. BZ26-6-B,3 754 m,太古界,纯气相包裹体,透射光下呈黑色,紫外光激发呈黄白色微弱荧光,石英颗粒内成岩裂纹中分布,其中e为单偏光,f为荧光;g,h. BZ26-6-E,4 050 m,太古界,纯气相包裹体,透射光下呈黑色,紫外光激发无荧光,石英颗粒内成岩裂纹中呈串珠状分布,其中g为单偏光,h为荧光;i,j. BZ26-6-E,4 255 m,太古界,原油包裹体,透射光下呈灰黑色,紫外光激发蓝色荧光,石英颗粒内成岩裂纹中呈群体状分布,其中i为单偏光,f为荧光;k,l. BZ26-6-E,4 255 m,太古界,石英颗粒粒间孔隙内见黑褐色沥青和发蓝色荧光油浸染,其中k为单偏光,l为荧光
Fig. 8. Plane-polarized and fluorescence images of fluid inclusions from the Bozhong 26-6 buried hill oilfield reservoir
图 9 渤中26-6潜山油田储层流体包裹体均一温度-古盐度相关图
Ⅰ期包裹体来自BZ26-6-A井3 139~3 275 m,太古界,石英颗粒内成岩裂纹中分布的正常原油包裹体;Ⅱ期包裹体来自BZ26-6-A井3 139~3 275 m,太古界,石英颗粒内成岩裂纹中分布的凝析油气包裹体;Ⅲ期包裹体主要来自BZ26-6-B井3 754~4 258 m,太古界,石英颗粒内成岩裂纹中轻质油包裹体
Fig. 9. Uniformity temperature paleosalinity correlation diagram of inclusion in Bozhong 26-6 buried hill oilfield reservoir
图 11 渤中26-6潜山油田成藏过程
剖面见图 1b中位置B;Ar. 太古界;E1k. 沙河街组三段;E2s3. 沙河街组三段;E3s1-2. 沙河街组一、二段;E3d. 东营组;N1g. 馆陶组;N2m. 明化镇组;Qp. 平原组
Fig. 11. Reservoir Formation Process of Bozhong 26-6 Buried Hill Oilfield
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