Influence of source-reservoir contact conditions on the enrichment of near-source tight oil: taking Chang 81 reservoir in the Longdong area of Ordos Basin as an example
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摘要: 对致密油地质特征的认识已经相对成熟,但对致密油分布规律的认识还有许多急需回答的问题。通过岩心、测井、物性等资料的综合分析,并借助均质储层原油充注动力的理想化模型,研究了源储接触关系对鄂尔多斯盆地陇东地区长81段近源致密油富集的影响。根据实际地质条件, 可将源储接触关系细分为直接接触型、过渡接触型、泥质隔挡型和裂缝沟通型四种类型。其中,直接接触型和裂缝沟通型对致密油的运聚有利,而过渡接触型和泥质隔挡型对致密油的运移具有明显的阻挡作用。陇东地区长81段致密储层中的油井大多分布于源储间泥质岩层厚度小于4 m的区域内,而水井和干井大多分布于源储间泥质岩层厚度大于4 m的区域内。源储接触关系决定了原油在近源致密储层中的富集程度,在对诸如鄂尔多斯盆地延长组长81段近源致密油的勘探过程中,不但要寻找利于原油侧向运移的储层“甜点区”,还需重点考虑源储接触关系类型对致密油成藏的影响。Abstract: The geological characteristics of tight oil have been relatively well understood, but there are certain questions needed to be answered regarding the distribution of tight oil. With comprehensive analysis of core, well logging and physical properties, and by means of mathematical calculation, the effects of the source-reservoir contact conditions on the enrichment of near-source tight reservoir of the first section of the eighth member of Yanchang Formation (Chang 81) in the Longdong area of Ordos Basin were studied in this paper. Results show that the source-reservoir contact conditions can be classified as four types including direct contact, transitional contact, fracture connected, and mudstone barrier. Among them, the direct contact and fracture connected types are favorable for the migration and accumulation of tight oil, while the transitional contact and mudstone barrier types have an obvious barrier effect for the migration of tight oil. The oil wells in the Chang 81 member in the Longdong area are mainly located in regions with a thickness of mudstone barrier less than 4 m, while the water or dry wells are mainly located in regions with a mudstone barrier thickness greater than 4 m. Based on the above calculation, it can be concluded that the source-reservoir contact condition determines the enrichment and vertical migration distance of tight oil. For the exploration of near-source tight oil, not only the "sweet zone" of the reservoir is conducive, the type of the source-reservoir contact condition should also be considered as a key factor.
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Key words:
- source-reservoir contact relationship /
- enrichment mechanism /
- tight oil /
- Yangchang Formation /
- Triassic /
- Ordos Basin
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图 6 鄂尔多斯盆地延长组近源储层中岩心和野外剖面中观察到的裂缝照片
a.C269井,长6段,2 448.0~2 448.6 m,裂缝在泥岩段截止;b.Z48井,长8段,1 276.3 m,裂缝在砂泥界面截止;c.B24井,长8段,1 844.8 m,高角度裂缝在泥岩中转向;d.Z82井,长6段,1 255.0 m,裂缝在砂泥界面处搓断;e.P112井,长8段,2 179.8 m,泥岩中的摩擦镜面发生搓断或转向;f.N213井,长8段,1 747.5 m,裂缝发生搓断;g.宜川剖面,长8段,裂缝未贯穿1.2 m厚的泥岩;h.铜川剖面,长71段,裂缝在50 cm厚泥岩处截止
Figure 6. Fractures observed from cores and field sections of near-source reservoir in Yanchang Formation, Ordos Basin
表 1 鄂尔多斯盆地姬塬地区长6段不同构造砂岩力学参数测试结果
Table 1. Test results of mechanical parameters of Chang 6 sandstone samples in Jiyuan area, Ordos Basin
井号 深度/m 岩性 取样方向 抗压强度/MPa A36 1 937.0 块状砂岩 垂直层面 193.8 A36 1 937.0 块状砂岩 平行层面 197.1 Y71 2 419.5 块状砂岩 垂直层面 181.4 Y71 2 419.5 块状砂岩 平行层面 188.4 C251 2 498.6 含泥质纹层砂岩 垂直层面 177.8 C251 2 498.6 含泥质纹层砂岩 平行层面 164.4 J22 2 385.5 含泥质纹层砂岩 垂直层面 171.3 J22 2 385.5 含泥质纹层砂岩 平行层面 159.6 -
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