致密油“近源成藏”关键地球化学证据——以鄂尔多斯盆地延长组近源组合为例

肖正录; 李勇; 喻健; 张海; 路俊刚; 尹相东; 韩玫梅

doi:10.11781/sysydz202303517

致密油“近源成藏”关键地球化学证据——以鄂尔多斯盆地延长组近源组合为例

doi: 10.11781/sysydz202303517

肖正录^{1, 2, 3,},
李勇^{1, 2, 3, ,},
喻健⁴,
张海⁵,
路俊刚^{1, 2, 3},
尹相东^{1, 2, 3},
韩玫梅^{1, 2, 3}

1.
西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500
2.
西南石油大学天然气地质四川省重点实验室, 成都 610500
3.
西南石油大学地球科学与技术学院, 成都 610500
4.
中国石油长庆油田分公司, 西安 710018
5.
延长油田股份有限公司, 陕西延安 716000

基金项目:

国家自然科学基金 42002176

国家自然科学基金 42072185

中国石油—西南石油大学创新联合体科技合作项目 2020CX050000

详细信息

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

通讯作者:
李勇(1993-), 男, 博士, 讲师, 从事非常规油气地质和油气成藏方面的研究。E-mail: 1041257867@qq.com

中图分类号: TE122
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- 被引次数: 0
出版历程
- 收稿日期: 2022-09-05
- 修回日期: 2023-04-14
- 刊出日期: 2023-05-28

Key geochemical evidence of "near-source accumulation" of tight oil: a case study of near-source assemblage of Triassic Yanchang Formation in Ordos Basin

XIAO Zhenglu^{1, 2, 3
,},
LI Yong^{1, 2, 3
, ,},
YU Jian⁴,
ZHANG Hai⁵,
LU Jungang^{1, 2, 3},
YIN Xiangdong^{1, 2, 3},
HAN Meimei^{1, 2, 3}

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.
PertoChina Changqing Oilfield Company, Xi'an, Shaanxi 710018, China
5.
Yanchang Oilfield Company, PetroChina, Yan'an, Shaanxi 716000, China

摘要

摘要: 致密油“近源成藏”的结论是依据石油在低渗储层中难以长距离侧向运移的储层特征推断得出的，一直以来缺乏地球化学方面的直接证据。基于对鄂尔多斯盆地三叠系延长组近源组合(长6段—长8₁亚段)中烃源岩特征和油源差异性的分析，探究了致密油近源成藏的地球化学依据，并解释了引起近源成藏的原因。研究区近源组合中的石油皆来自于原位长7烃源岩，即便是邻近区块的油源也存在差异，石油在致密储层中难以发生大规模的侧向运移。鄂尔多斯盆地长7段烃源岩的生物标志化合物在平面上具有显著差异，并沿沉积中心呈环带状分布。不同相带生物标志化合物组合差异导致的油源差异，是前期学者们发现致密油“近源成藏”的根本原因。致密油“近源成藏”改变了之前油源对比全盆地、同一层烃源岩一概而论的观点，对未来单一盆地中不同类型油气资源量的分区分带精细评价具有重要意义。
- 近源成藏 /
- 致密油 /
- 油源对比 /
- 延长组 /
- 三叠系 /
- 鄂尔多斯盆地
Abstract: The conclusion of "near-source accumulation" of tight oil is inferred based on the reservoir characte-ristics that crude oil is difficult to migrate laterally for a long distance in low-permeability reservoirs, yet there has been no direct geochemical evidence for a long time. Based on the analysis of the characteristics of source rocks and the source differences of oil in the near-source assemblage (Chang 6 member to Chang 8₁ sub-member) of the Tirassic Yanchang Formation in the Ordos Basin, this paper explores the geochemical basis of tight oil near-source accumulation and explains its cause. The results show that the crude oil in the near-source assemblage comes from the in-situ Chang 7 source rocks, and even the oil sources in the adjacent blocks are different. It is difficult for crude oil to undergo large-scale lateral migration in a tight reservoir. The biomarker compounds of Chang 7 source rocks in the Ordos Basin have significant differences in the plane and are distributed in a circularbelt along the sedimentary center. The oil source difference caused by the combination difference ofbiomarker compounds in different facies zones is the fundamental reason for the predecessors' discovery of "near-source accumulation" of tight oil. The "near-source accumulation" of tight oil has changed the previous view that oilsource correlation is a generalization of the whole basin and the source rocks of the same layer, and has important significance for the zoning and fine evaluation of different types of oil and gas resources in a single basin in the future.
- near-source accumulation /
- tight oil /
- oil-source correlation /
- Yanchang Formation /
- Triassic /
- Ordos Basin

HTML全文

图 1 鄂尔多斯盆地三叠系延长组近源组合致密油的平面分布及源储配置关系

Figure 1. Tight oil plane distribution and source-reservoir configuration relationship of near-source assemblage of Triassic Yanchang Formation in Ordos Basin

下载: 全尺寸图片幻灯片

图 2 鄂尔多斯盆地三叠系延长组18个主要含油区块长7烃源岩的TOC值统计直方图

Figure 2. Statistical histogram of TOC values of Triassic Chang 7 source rocks in 18 main oil-bearing blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 3 鄂尔多斯盆地三叠系延长组18个主要含油区块长7段烃源岩的干酪根显微组分三元图

Figure 3. Ternary diagram of kerogen macerals of Triassic Chang 7 source rock in 18 main oil-bearing blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 4 鄂尔多斯盆地三叠系延长组18个主要含油区块长7烃源岩的镜质体反射率统计直方图

Figure 4. Statistical histogram of R_o values of Triassic Chang 7 source rock in 18 main oil-bearing blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 5 鄂尔多斯盆地典型区块三叠系延长组近源组合中烃源岩和储层抽提物的GC-MS谱图

Figure 5. GC-MS spectrum of source rock and reservoir extracts in near-source assemblage of Triassic Yanchang Formation in typical blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 6 鄂尔多斯盆地18个主要含油区块三叠系延长组近源组合中岩石抽提物的甾烷C₂₇/C₂₉和Pr/Ph交会图

Figure 6. Cross plots of sterane C₂₇/C₂₉ and Pr/Ph of rock extracts in near-source assemblage of Triassic Yanchang Formation in 18 main oil-bearing blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 7 鄂尔多斯盆地18个主要含油区块三叠系延长组近源组合岩石抽提物的C₃₀H/C₃₀DiaH和Ts/Tm交会图

Figure 7. Cross plots of C₃₀H/C₃₀DiaH and Ts/Tm of rock extracts in near-source assemblage of Triassic Yanchang Formation in 18 main oil-bearing blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 8 鄂尔多斯盆地18个主要含油区块三叠系延长组近源组合岩石抽提物的C₃₀H/C₃₀DiaH、规则甾烷C₂₇/C₂₉和Pr/Ph三元图

Figure 8. Ternary diagram of C₃₀H/C₃₀DiaH, regular sterane C₂₇/C₂₉ and Pr/Ph of rock extracts in near-source assemblage of Triassic Yanchang Formation in 18 main oil-bearing blocks of Ordos Basin

下载: 全尺寸图片幻灯片

图 9 鄂尔多斯盆地三叠系长7烃源岩平面展布及油源分区分带特征

Figure 9. Plane distribution of Triassic Chang 7 source rocks and oil-source zoning characteristics in Ordos Basin

下载: 全尺寸图片幻灯片

表 1 鄂尔多斯盆地上畛子农场和转角区块三叠系延长组近源组合中烃源岩和储层抽提物的生物标志物化物特征

Table 1. Biomarker characteristics of source rock and reservoir extracts in near-source assemblage of Triassic Yanchang Formation in Shangzhenzi farm and Zhuanjiao block, Ordos Basin

区块	层位	井号	深度/m	Pr/Ph	C₂₇/C₂₉	Ts/Tm	C₃₀H/C₃₀DiaH
上畛子农场	长7	Z59	1 263.20	0.62	0.72	1.44	8.15
	长6	N71	1 651.40	0.75	0.82	1.15	5.77
		Z36	1 188.15	0.99	0.89	1.13	8.74
		Z59	773.70	0.76	0.74	1.17	5.10
转角	长7	Z104	1 587.30	0.73	0.61	1.76	6.69
	长7	Z25	553.20	0.93	0.53	0.36	12.31
	长8	Z40	1 275.00	0.97	0.61	0.62	10.16
		Z23	1 253.90	0.93	0.68	0.80	10.62
		Z48	1 270.20	0.93	0.69	0.50	13.00

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