鄂尔多斯盆地东南部柴上塬区三叠系延长组长6致密油成藏主控因素及富集规律

王卓; 赵靖舟; 孟选刚; 赵世虎; 沈振振; 张恒; 高飞龙

doi:10.11781/sysydz202202251

鄂尔多斯盆地东南部柴上塬区三叠系延长组长6致密油成藏主控因素及富集规律

doi: 10.11781/sysydz202202251

王卓^{1, 2, 3,},
赵靖舟^{1, 2, ,},
孟选刚⁴,
赵世虎³,
沈振振⁴,
张恒⁴,
高飞龙⁴

1.
西安石油大学地球科学与工程学院, 西安 710065
2.
陕西省油气成藏地质学重点实验室, 西安 710065
3.
长庆油田第一采油厂, 陕西延安 716000
4.
延长油田股份有限公司七里村采油厂, 陕西延安 716000

基金项目:

国家“十三五”科技重大专项 2016ZX05050

详细信息

作者简介:
王卓(1995—)，男，硕士，助理工程师，从事油气成藏地质学、开发地质研究。E-mail：229134890@qq.com

通讯作者:
赵靖舟(1962—)，男，教授，从事油气成藏地质学、天然气地质及地球化学等方面的研究。E-mail: jzzhao@xsyu.edu.cn

中图分类号: TE122.3
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出版历程
- 收稿日期: 2021-01-20
- 修回日期: 2022-01-04
- 刊出日期: 2022-03-28

Key controlling factors and enrichment mechanisms of tight reservoirs in 6th member of Triassic Yanchang Formation, Chaishangyuan area, southeastern Ordos Basin

WANG Zhuo^{1, 2, 3
,},
ZHAO Jingzhou^{1, 2
, ,},
MENG Xuangang⁴,
ZHAO Shihu³,
SHEN Zhenzhen⁴,
ZHANG Heng⁴,
GAO Feilong⁴

1.
College of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
2.
Key Laboratory of Shaanxi Province for Petroleum Accumulation Geology, Xi'an, Shaanxi 710065, China
3.
No.1 Oil Production Plant, Changqing Oilfield, Yan'an, Shaanxi 716000, China
4.
Qilicun Oil Production Plant, Yanchang Oilfield, Yan'an, Shaanxi 716000, China

摘要

摘要: 鄂尔多斯盆地东南部柴上塬区位于中国陆上发现的第一个油田——七里村油田，主力含油层为三叠系延长组长6油层。目前，对该区长6致密油成藏主控因素还缺乏全面深入研究。在综合分析钻井、录井、电测井、岩心、试油、生产动态等资料的基础上，结合室内实验观测，并引入下伏砂地比和上覆泥地比概念，对研究区长6油藏成藏特征以及烃源岩、储层、构造、盖层、运移条件等因素对长6致密油藏的控制作用进行了全面剖析。研究区长6致密油藏为边底水不发育的岩性油藏，具有集群准连续分布特征，形成和分布受烃源、输导条件、储层、直接盖层四大因素控制，且四者对油藏的控制作用依次减弱。区内东部烃源较差，原油富集区为砂体发育较好的下段地层；而西部烃源较好，盖层和输导条件则更多控制着原油的富集程度，是否利于成藏取决于两者耦合关系的好坏。
- 主控因素 /
- 富集规律 /
- 长6油藏 /
- 柴上塬区 /
- 鄂尔多斯盆地
Abstract: Chaishangyuan area locates in the Qilicun Oilfield of the southeastern Ordos Basin, the first onshore oil field discovered in China, and its main layer for oil-producing is the 6th member of Triassic Yanchang Formation (Chang 6). At present, the comprehensive study on the key controlling factors of Chang 6 tight oil reservoir in this area is not clear. In this paper, a large number of drilling, logging, core, production test and other data, combined with laboratory experimental observation were carried out to progress the understanding of the factors controlling reservoir formation. In addition, the concepts of the ratio of underlying sand thickness to formation thickness and the ratio of overlying mud thickness to formation thickness were introduced to comprehensively analyze the forming characteristics of Chang 6 reservoir in the study area and the controlling effects of source rocks, reservoirs, structures, caprocks and migration conditions on Chang 6 tight reservoirs. The Chang 6 tight reservoir in the study area is a lithologic reservoir with undeveloped edge and bottom water, which has the characteristics of clustered and quasi-continuous distribution, and its formation and distribution were controlled by four factors: hydrocarbon source, transport condition, reservoir and direct caprock, and the controlling effect of the four factors on the reservoir is weakened in turn. In the eastern area where source rock quality is poor, crude oil was mainly enriched in the lower strata where sand bodies were well developed, while in the western area where source rock quality is relatively better, the enrichment of crude oil was more controlled by caprock and transport conditions. The better the coupling relationship between them, the more conducive to reservoir formation.
- main controlling factor /
- enrichment rule /
- Chang 6 reservoir /
- Chaishangyuan area /
- Ordos Basin

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图 1 鄂尔多斯盆地东南部柴上塬区位置

Figure 1. Location of Chaishangyuan area, southeastern Ordos Basin

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图 2 鄂尔多斯盆地东南部柴上塬区丛12-2井—南22-2井连井油藏剖面

连井剖面位置见图 4的AA′。

Figure 2. Reservoir profile from well C12-2 to N22-2 in Chaishangyuan area, southeastern Ordos Basin

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图 3 鄂尔多斯盆地东南部柴上塬区三叠系长6各层砂厚及油层显示厚度分布

Figure 3. Distribution of sand thickness and displayed thickness of each layer of Chang 6 in Chaishangyuan area, southeastern Ordos Basin

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图 4 鄂尔多斯盆地东南部柴上塬区三叠系长6₁⁴和长6₂²小层油层厚度

Figure 4. Oil layer thickness of Chang 6₁⁴ and Chang 6₂² in Chaishangyuan area, southeastern Ordos Basin

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图 5 鄂尔多斯盆地东南部柴上塬区长6₁⁴顶面构造与初产叠合图

Figure 5. Superimposed map of top structure and first production of Chang 6₁⁴ in Chaishangyuan area, southeastern Ordos Basin

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图 6 鄂尔多斯盆地东南部柴上塬区烃源岩厚度与试产和S_o交会图

Figure 6. Intersection diagram of source rock thickness vs. trial production and S_o in Chaishangyuan area, southeastern Ordos Basin

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图 7 鄂尔多斯盆地东南部柴上塬区砂地比与初产和S_o交会图

Figure 7. Intersection diagram of sand-formation ratio vs. first production and S_o in Chaishangyuan area, southeastern Ordos Basin

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图 8 鄂尔多斯盆地东南部柴上塬区长6₂²、长6₁⁴物性与初月产油和油层厚度交会图

Figure 8. Intersection among physical properties of Chang 6₂² and Chang 6₁⁴ and first production and oil layer thickness in Chaishangyuan area, southeastern Ordos Basin

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图 9 鄂尔多斯盆地东南部柴上塬区岩心裂缝照片

a.东探016井，454.72~456.4 m，长7₃，黑色页岩中垂直缝；b.郑085井，480~488 m，长6₄，砂岩中垂直缝

Figure 9. Fractures in core samples from Chaishangyuan area, southeastern Ordos Basin

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图 10 鄂尔多斯盆地东南部柴上塬区烃源岩荧光照片

a.东探016井，454.2 m，长7₃，黑色页岩，荧光下(左)，垂直缝中见黄褐色荧光，单偏光下(右)，微裂缝中见深褐色残余油质；b.郑085井，447.25 m，长6₄，暗色泥岩，荧光下(左)，垂直缝中见黄褐色荧光，单偏光下(右)，微裂缝中见深褐色残余油质；c.东探016井，462.35 m，长7₃，黑色页岩，荧光下(左)，垂直缝中见暗黄色荧光，单偏光下(右)，微裂缝中见黄褐色残余油质；d.东探016井，462.80 m，长7₃、暗色泥岩，荧光下(左)，垂直缝中见亮黄色荧光，单偏光下(右)，微裂缝中见深褐色残余油质

Figure 10. Fluorescence photos of source rocks in Chaishangyuan area, southeastern Ordos Basin

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图 11 鄂尔多斯盆地东南部柴上塬区下伏砂地比与试油产量和S_o交会图

Figure 11. Intersection between the ratio of underlying sand thickness to formation thickness and trial production and S_o in Chaishangyuan area, southeastern Ordos Basin

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图 12 鄂尔多斯盆地东南部柴上塬区上覆泥地比与初月产量和S_o交会图

Figure 12. Intersection between the ratio of overlying mud thickness to formation thickness and first production and S_o in Chaishangyuan area, southeastern Ordos Basin

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图 13 鄂尔多斯盆地东南部柴上塬区郑058井—东探014井NW—SE向油藏剖面

连井剖面位置见图 4a的BB′。

Figure 13. Reservoir profile in NW-SE direction from well Z058 to DT014 in Chaishangyuan area, southeastern Ordos Basin

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表 1 鄂尔多斯盆地东南部柴上塬区三叠系长6原油物性统计

Table 1. Physical properties of crude oils of Chang 6 in Chaishangyuan area, southeastern Ordos Basin

原油物性	最大值	最小值	平均值
密度(20 ℃)/(g·cm^-3)	0.86	0.81	0.83
黏度(50 ℃)/(mPa·s)	5.95	2.69	4.22
含硫/%	0.07	0	0.04
含蜡/%	19.32	0	11.95
凝固点/℃	17.50	5.50	6.55

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表 2 鄂尔多斯盆地东南部柴上塬区三叠系长6原油族组分含量

Table 2. Crude oil group composition of Chang 6 in Chaishangyuan area, southeastern Ordos Basin

井名	饱和烃/%	芳烃/%	非烃/%	沥青质/%	总烃/%	饱芳比
郭807	65.68	13.24	6.05	1.17	78.92	4.96
南110-4	64.40	10.20	4.48	6.21	74.60	6.31
东探022	59.26	11.09	13.81	2.88	70.35	5.34
七平5	52.84	9.84	26.21	11.05	62.68	5.37
七平10	55.14	9.90	20.76	0.68	65.04	5.57
南71	65.08	11.15	7.74	4.36	76.23	5.84
米291	68.18	10.58	4.78	2.36	78.76	6.44
吴34	61.82	9.60	3.50	10.80	71.42	6.44
郑058	73.44	10.90	5.34	3.50	84.34	6.74
军407	72.52	4.25	4.39	5.44	76.77	17.07

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