基于不同砂体结构的宏观非均质性评价方法——以鄂尔多斯盆地合水地区长8油层组为例

陈朝兵; 付玲; 南凡驰; 冉婧; 陈新晶; 宗超伦; 李昊远

doi:10.11781/sysydz202102242

基于不同砂体结构的宏观非均质性评价方法——以鄂尔多斯盆地合水地区长8油层组为例

doi: 10.11781/sysydz202102242

陈朝兵^{1, 2,},
付玲^3, ,,
南凡驰^{1, 2},
冉婧⁴,
陈新晶⁵,
宗超伦⁶,
李昊远¹

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.
中国石油勘探开发研究院, 北京 100083
4.
中国石油长庆油田分公司对外合作部, 西安 710200
5.
中国石油长庆油田分公司第六采油厂, 西安 710200
6.
中国石油华北油田分公司第五采油厂, 河北任丘 052360

基金项目:

国家自然科学基金 41802140

陕西省自然科学研究基础计划项目 2019JQ-257

刘宝珺地学科学基金 DMSM2019007

国家科技重大专项 2016ZX05050006

详细信息

作者简介:
陈朝兵(1984—)，男，讲师，从事石油地质与储层评价研究。E-mail：395286273@qq.com

通讯作者:
付玲(1989—)，女，博士，高级工程师，从事油气勘探研究。E-mail：fuling@petrochina.com.cn

中图分类号: TE311
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- 文章访问数: 350
- HTML全文浏览量: 62
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-05
- 修回日期: 2021-01-28
- 刊出日期: 2021-03-28

Macro-heterogeneity evaluation based on different sand body structures: a case study of Chang 8 reservoir group in Heshui area, Ordos Basin

CHEN Zhaobing^{1, 2
,},
FU Ling^{3
, ,},
NAN Fanchi^{1, 2},
RAN Jing⁴,
CHEN Xinjing⁵,
ZONG Chaolun⁶,
LI Haoyuan¹

1.
School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
2.
Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an, Shaanxi 710065, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
4.
Department of Foreign Cooperation, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710200, China
5.
No.6 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710200, China
6.
No.5 Oil Production Plant, PetroChina Huabei Oilfield Company, Renqiu, Hebei 052360, China

摘要

摘要: 宏观非均质性是影响油田开发效果的重要因素之一，尤其是对于砂体结构复杂的三角洲沉积环境，非均质性严重制约了油藏的高效开发。以鄂尔多斯盆地合水地区上三叠统延长组长8油层组为例，通过露头剖面观测、岩心观察、测井及生产动态资料，分析砂体结构类型及特征，建立了储层宏观非均质性评价方法。研究区长8浅水三角洲发育连续叠加型、间隔叠加型、侧向单层型和砂泥互层型等4种砂体结构。层内夹层及层间隔层导致砂体空间连续性降低，连续叠加型的隔夹层发育程度及渗透率非均质性最弱，其宏观非均质性最弱；其次是间隔叠加型和侧向单层型；砂泥互层型的宏观非均质性最强。选取夹层密度D_k、夹层频率P_k和储层质量系数R_QI构建层内非均质性评价指数N，N指数能够反映不同砂体结构下的单砂体层内流体驱替特征及含水率变化。选取砂岩百分比S_n、单位厚度层间砂体层数T等参数构建层间非均质性评价指数J，J指数是评价和预测油井产液强度的较好度量。因此，层内非均质性指数N和层间非均质性指数J能够用于油藏的宏观非均质性评价。
- 宏观非均质性 /
- 隔层 /
- 夹层 /
- 砂体结构 /
- 鄂尔多斯盆地
Abstract: Macro-heterogeneity is one of the important factors affecting oilfield development, especially for deltaic sedimentary environments with complex sand body structures. The structure type and characteristics of sand bodies were analyzed for Chang 8 reservoir group (the eighth member of Upper Triassic Yanchang Formation) in the Heshui area of the Ordos Basin. An evaluation method for reservoir macro-heterogeneity was established based on outcrop and core observation, and logging and production performance data. Four sand body structures in the Chang 8 shallow water delta were identified, including continuous superposition, interval superposition, lateral single layer and sand-mud interbedded types. The interlayers and restraining barriers lead to the decrease of the spatial continuity of sand body. Generally, the development degree of interlayers and permeability heterogeneity of the continuous superimposed type is the weakest, and the macro-heterogeneity is the weakest, followed by the interval superposition and the lateral single layer types, while the macro-heterogeneity of sand-mud interbedding type is the strongest. The interlayer density (D_K), interlayer frequency (P_k) and reservoir quality coefficient (R_QI) were selected to construct the evaluation index (N) of intraformational heterogeneity. The N index can reflect the fluid displacement characteristics and water content change of single sand body within different sand body structures. The evaluation index J of interlayer heterogeneity was constructed by selecting parameters such as the percentage of sandstone (S_n) and the number of interlayer sand layers per unit thickness (T). The J index is a good measure to evaluate and predict the fluid production strength of oil wells. Therefore, the intraformational heterogeneity index (N) and interlayer heterogeneity index (J) can be used to evaluate the macro-heterogeneity of reservoirs.
- macro-heterogeneity /
- interlayers /
- restraining barriers /
- sand body structure /
- Ordos Basin

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图 1 研究区位置及地层岩性柱状图

Figure 1. Location and stratigraphic column of study area

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图 2 鄂尔多斯盆地合水地区延长组长8储层基本特征

Figure 2. Basic characteristics of Chang 8 reservoir in Heshui area, Ordos Basin

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图 3 野外露头剖面识别的延长组长8砂体结构类型

Figure 3. Structure type of Chang 8 sand bodies identified in outcrop profile

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图 4 鄂尔多斯盆地合水地区延长组长8储层隔夹层特征(L20井)

Figure 4. Characteristics of permeability barriers and interlayers in Chang 8 reservoir, well L20, Heshui area, Ordos Basin

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图 5 鄂尔多斯盆地合水地区延长组长8储层不同砂体结构渗透率非均质性变化

Figure 5. Variation of permeability heterogeneity of different sand bodies in Chang 8 reservoir, Heshui area, Ordos Basin

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图 6 鄂尔多斯盆地合水地区延长组长8不同砂体结构宏观非均质性评价模型

Figure 6. Macro-heterogeneity evaluation model of different sand body structures of Chang 8 reservoir, Heshui area, Ordos Basin

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图 7 宏观非均质性评价指数与生产动态参数相关性

Figure 7. Correlation between macro-heterogeneity evaluation index and production dynamic parameters

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表 1 鄂尔多斯盆地合水地区延长组长8砂体结构划分

Table 1. Structure division of Chang 8 sand body in Heshui area, Ordos Basin

表 2 鄂尔多斯盆地合水地区延长组长8储层单砂体隔层及夹层厚度统计

Table 2. Thickness of permeability barriers and interlayers of single sand bodies in Chang 8 reservoir, Heshui area, Ordos Basin

砂体类型	夹层厚度/ m	夹层频率/ %	夹层密度/ (条·m^-1)	隔层厚度/ m	隔层频率/ %	隔层密度/ (条·m^-1))	井数/ 口
连续叠加型	0.35	5.7	0.18				17
间隔叠加型				1.5	26.3	0.46	17
侧向单层型				5.4	43.0	0.64	17
砂泥互层型				3.2	69.3	0.78	17

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表 3 鄂尔多斯盆地合水地区延长组长8油藏宏观非均质性指数与生产数据的关系统计

Table 3. Correlation between macro-heterogeneity index and production data of Chang 8 reservoir, Heshui area, Ordos Basin

类型	井号	射孔段			砂体结构类型	层内非均质性指数N	层间非均质性指数J	生产数据
类型	井号	顶深 /m	底深/ m	厚度/ m	砂体结构类型	层内非均质性指数N	层间非均质性指数J	日产液量/ m³	含水率/ %	产液强度/ (m³·d^-1·m^-1)
X26-25井组	X25-23	2 213.5	2 219.0	5.5	侧向单层型	0.44	2.2	2.4	100.0	0.43
	X25-24	2 210.0	2 217.0	7.0	间隔叠加型	0.53	1.6	5.1	93.8	0.73
	X25-25	2 169.0	2 175.0	6.0	连续叠加型	0.78		4.3	79.5	0.71
	X26-24	2 245.0	2 250.0	5.0	侧向单层型	0.41	1.5	3.4	99.9	0.67
	X26-26	2 153.0	2 159.0	6.0	间隔叠加型	0.74	2.3	8.6	95.9	1.44
	X27-25	2 286.0	2 292.0	6.0	连续叠加型	0.65		18.8	98.5	3.14
	X27-26	2 157.0	2 170.0	13.0	间隔叠加型	0.41	1.6	5.0	84.7	0.39
X44-30井组	X42-28	2 224.0	2 236.0	12.0	连续叠加型	1.10		3.9	45.3	0.33
	X42-29	2 182.5	2 190.0	7.5	间隔叠加型	0.84	1.8	3.6	10.4	0.47
	X42-30	2 116.0	2 125.0	9.0	侧向单层型	0.54	0.9	1.9	78.5	0.21
	X43-29	2 131.5	2 148.0	16.5	间隔叠加型	0.29	0.7	2.9	98.5	0.17
	X43-31	2 153.0	2 198.0	45.0	连续叠加型	0.80		2.8	24.9	0.06
	X44-30	2 084.0	2 134.0	50.0	间隔叠加型	0.39	0.8	4.5	78.7	0.09
	X44-31	2 053.2	2 104.0	50.8	连续叠加型	0.62		4.3	54.0	0.09
	X44-32	2 089.0	2 138.0	49.0	间隔叠加型	0.45	1.2	3.2	49.7	0.07

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