源储接触关系及其对近源致密油富集的影响——以鄂尔多斯盆地陇东地区长8<sub>1</sub>油藏为例

肖正录; 李勇; 朱志勇; 路俊刚; 卢子兴; 李程善

doi:10.11781/sysydz202205825

源储接触关系及其对近源致密油富集的影响——以鄂尔多斯盆地陇东地区长8₁油藏为例

doi: 10.11781/sysydz202205825

肖正录^{1, 2, 3,},
李勇^{1, 3},
朱志勇⁴,
路俊刚^{1, 3},
卢子兴⁵,
李程善⁵

1.
油气藏地质及开发工程国家重点实验室(西南石油大学), 成都 610500
2.
天然气地质四川省重点实验室(西南石油大学), 成都 610500
3.
西南石油大学地球科学与技术学院, 成都 610500
4.
中石油物资股份有限公司西安分公司, 西安 710000
5.
长庆油田勘探开发研究院, 西安 710000

基金项目:

国家自然科学基金 41872165

国家自然科学基金 42002176

详细信息

作者简介:
肖正录(1994-), 男, 博士, 从事油气地球化学和非常规油气地质研究。E-mail: xiaozl@163.com

中图分类号: TE122.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-30
- 修回日期: 2022-08-01
- 刊出日期: 2022-09-28

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

XIAO Zhenglu^{1, 2, 3
,},
LI Yong^{1, 3},
ZHU Zhiyong⁴,
LU Jungang^{1, 3},
LU Zixing⁵,
LI Chengshan⁵

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2.
Natural Gas Geology Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3.
School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
4.
Xi'an Branch of PetroChina Materials Co., Ltd., Xi'an, Shaanxi 710000, China
5.
Research Institute of Exploration and Development, Changqing Oilfield Company, Xi'an, Shaanxi 710000, China

摘要

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。
- 源储接触关系 /
- 富集规律 /
- 致密油 /
- 延长组 /
- 三叠系 /
- 鄂尔多斯盆地
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.
- source-reservoir contact relationship /
- enrichment mechanism /
- tight oil /
- Yangchang Formation /
- Triassic /
- Ordos Basin

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图 1 研究区位置及鄂尔多斯盆地上三叠统延长组地层柱状图

Figure 1. Location of study area and stratigraphic column of Upper Triassic Yanchang Formation in Ordos Basin

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图 2 致密油充注理想化模型

Figure 2. Idealized model of tight oil charging

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图 3 鄂尔多斯盆地陇东地区长8段致密砂岩原油充注实验结果

Figure 3. Experimental results of oil injection into Chang 8 tight sandstone in Longdong area, Ordos Basin

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图 4 源储接触关系在鄂尔多斯盆地陇东地区典型井上的反映

Figure 4. Reflection of contact relationship between source and reservoir in typical wells in Longdong area, Ordos Basin

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图 5 鄂尔多斯盆地延长组近源储层中典型的岩心照片

a.A36井，1 937 m，长6段，细砂岩，块状层理；b.Y71井，2 419.5 m，长6段，细砂岩，块状层理；c.C251井，2 498.6 m，长6段，细砂岩，砂纹层理；d.J22井，2 385.5 m，长6段，细砂岩，砂纹层理

Figure 5. Typical core photos of near-source reservoir of Yanchang Formation in 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

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图 7 鄂尔多斯盆地陇东地区长8₁油藏平面分布

Figure 7. Distribution of Chang 8₁ oil reservoir in Longdong area, Ordos Basin

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图 8 鄂尔多斯盆地陇东地区长7烃源岩与长8₁储层间泥质岩层等厚图

Figure 8. Isopach map of argillaceous rocks between Chang 7 source rock and Chang 8₁ reservoir in Longdong area, Ordos Basin

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图 9 鄂尔多斯盆地陇东地区长8₁储层渗透率平面分布

Figure 9. Permeability distribution of Chang 8₁ reservoir in Longdong area, Ordos Basin

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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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