烃源岩层系地层破裂情况的定量评价及应用

郝牧歌; 张金功; 高艺; 李健; 马士磊

doi:10.11781/sysydz202205922

烃源岩层系地层破裂情况的定量评价及应用

doi: 10.11781/sysydz202205922

郝牧歌^{1, 2,},
张金功^{1, 2},
高艺^{1, 2, ,},
李健³,
马士磊^{1, 2}

1.
西北大学地质学系, 西安 710069
2.
大陆动力学国家重点实验室, 西安 710069
3.
中国石化胜利油田分公司勘探开发研究院, 山东东营 257015

基金项目:

中国石化科技攻关项目 P16005

国家自然科学基金青年基金项目 42002119

详细信息

作者简介:
郝牧歌(1991-), 男, 博士研究生, 从事非常规油气勘探工作。E-mail: 525084508@qq.com

通讯作者:
高艺(1991-), 男, 博士, 讲师, 从事沉积学及石油地质学相关研究。E-mail: gaoyi@nwu.edu.cn

中图分类号: TE122.2
计量
- 文章访问数: 375
- HTML全文浏览量: 139
- PDF下载量: 43
- 被引次数: 0
出版历程
- 收稿日期: 2022-02-15
- 修回日期: 2022-07-12
- 刊出日期: 2022-09-28

Quantitative assessment for the formation fractures in source rock strata and its application

HAO Muge^{1, 2
,},
ZHANG Jingong^{1, 2},
GAO Yi^{1, 2
, ,},
LI Jian³,
MA Shilei^{1, 2}

1.
Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China
2.
State Key Laboratory of Continental Dynamics, Xi'an, Shaanxi 710069, China
3.
Exploration and Development Research Institute, Shengli Oilfield, Dongying, Shandong 257015, China

摘要

摘要: 地层破裂情况定量评价、破裂岩石对地层输导能力的促进作用研究，对非常规油气藏勘探具有重要的作用。通过同围压条件下岩石破裂压力与烃源岩层系围压影响范围的对比，对渤海湾盆地济阳坳陷渤南—四扣地区烃源岩层系静岩压力作用下的岩石破裂情况进行了定量研究，并实测了烃源岩层系岩石破裂对输导能力的影响。在此基础上提出了围压、破裂压力、破裂后输导能力综合比对研究地层破裂情况的方法。渤南—四扣区域烃源岩层系中，古近系沙河街组三段上、中亚段，区域较深部位砂岩、泥页岩岩层普遍产生破裂，中部位砂岩岩层产生破裂；沙河街组三段下亚段，区域中、深部位岩层普遍产生破裂；沙河街组四段上亚段，区域中、深部位岩层普遍产生破裂、高部位部分砂岩岩层产生破裂。破裂的地层渗透率大幅提升，能够作为有效输导通道。上述方法对现有“甜点”评价提供了有力补充。
- 烃源岩层系 /
- 破裂 /
- 输导 /
- 渤南—四扣地区 /
- 渤海湾盆地
Abstract: Quantitative evaluation of formation fractures and research on the promotion of fractured rocks on formation transport capacity are of certain importance to the exploration of unconventional oil and gas reservoirs. By comparing the rock fracturing pressure under the same confining pressure condition with the confining pressure range of the source rock series, the rock fracturing situation of the source rock series under the action of static rock pressure in the Bonan-Sikou area of Jiyang Depression, Bohai Bay Basin was analyzed. The effect of source rock fractures to the transporting capacity was quantitatively measured. On this basis, a method of comprehensive comparison of confining pressure, fracture pressure and post-fracture conductivity was proposed to study formation fracture. In the upper and middle sections of the third member of Paleogene Shahejie Formation in Bonan-Sikou area, the sandstones and shale rocks in the deeper strata are generally ruptured, and the sandstone layers in the middle strata are regionally ruptured. In the lower section of the third member of Shahejie Formation, the middle and deep strata are generally ruptured. In the uppersection of the third member of Shahejie Formation, the middle and deep strata are generally ruptured, whilst only part of sandstone layer in the upper part is ruptured. The fractured formation has greatly increased permeability and can be used as an effective conduction channel. The methods described above provide a powerful complement to existing "sweet spot" evaluations.
- source rock series /
- fracture /
- transport /
- Bonan-Sikou area /
- Bohai Bay Basin

HTML全文

图 1 渤海湾盆地济阳坳陷渤南—四扣地区位置及地层综合柱状图

据文献[18]修改。

Figure 1. Location and comprehensive histogram of stratigraphy of Bonan-Sikou area, Jiyang Depression, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 2 渤海湾盆地渤南—四扣地区无围压影响区域分布

Figure 2. Regional distribution of source rock strata not affected by confining pressure in Bonan-Sikou area, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 3 渤海湾盆地渤南—四扣地区样品S1及M7应变曲线

Figure 3. Strain curves of samples S1 and M7 from Bonan-Sikou area, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 4 渤海湾盆地渤南—四扣地区烃源岩层系静岩压力作用地层破裂范围

砂体展布据文献[17]修改。

Figure 4. Fracture range of source rock series under the action of static rock pressure in Bonan-Sikou area, Bohai Bay Basin

下载: 全尺寸图片幻灯片

图 5 渤海湾盆地渤南—四扣地区义160井烃源岩层系存在含油差异的岩心与薄片观察

a.沙三段综合录井图；b.3 165.1 m处含油岩心；c-h.3 165.1 m处，25倍镜下薄片照片；c.荧光，含垂向缝粉砂岩—泥页岩互层；d.单偏光，含垂向缝粉砂岩—泥页岩互层；e.荧光，含斜向缝粉砂岩—泥页岩互层；f.单偏光，含斜向缝粉砂岩—泥页岩互层; g.荧光，含平行层面缝粉砂岩—泥页岩互层；h.单偏光，含平行层面缝粉砂岩—泥页岩互层

Figure 5. Observation of cores and thin slices with oil-bearing differences in source rock strata of well Yi 160, Bonan-Sikou area, Bohai Bay Basin

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表 1 渤海湾盆地渤南—四扣地区典型岩石样本的矿物组成特征

Table 1. Mineral composition of typical rock samples from Bonan-Sikou area, Bohai Bay Basin

样品号	井号	埋深/m	岩石名称	矿物含量/%
样品号	井号	埋深/m	岩石名称	黏土矿物	石英	钾长石	斜长石	方解石	白云石	黄铁矿
S1	义3-3-7	3 111.50	含泥质细粒岩屑长石砂岩	20	42	9	27	2
S2	义3-3-7	3 119.94	不等粒长石岩屑砂岩	4	55	12	26	3
S3	义3-3-7	3 166.89	不等粒长石岩屑砂岩	11	55	10	21		3
S4	义3-3-7	3 353.40	含泥质细粒岩屑长石砂岩	20	42	9	27	2
S5	渤深3	3 542.27	不等粒岩屑长石砂岩	10	50	7	23	1	9
S6	义151	4 295.50	中粒岩屑长石砂岩	14	49		28	1	5	3
M7	罗67	3 309.80	白云质泥页岩	9	16		2	64	9
M8	义3-3-7	3 578.87	含白云质泥页岩	32	29		7	15	9	8
M9	渤深3	3 714.94	含白云质泥页岩	34	28		6	15	12	5
M10	罗67	3 272.20	泥页岩	22	17	1		50	5	5
M11	义3-7-7	3 126.30	泥页岩	58	27		8	2	5
注：岩石样本中均不含硬石膏、菱铁矿、岩盐及方沸石矿物。

下载: 导出CSV

表 2 渤海湾盆地典型岩石样本无围压作用下的破裂压力

Table 2. Fracture pressure of rock samples without confining pressure, Bohai Bay Basin

单轴应力作用下样品参数				三轴应力作用下样品参数
砂岩样品号	破裂压力/MPa	泥页岩样品号	破裂压力/MPa	砂岩样品号	破裂压力/MPa	泥页岩样品号	破裂压力/MPa
S1	99.5	M7	54.3	S1	199.8	M7	211.1
S2	33.4	M8	64.1	S2	73.8	M8	112.0
S3	40.1	M9	54.6	S3	105.6	M9	110.9
S4	72.5	M10	140.1	S4	121.6	M10	193.5
S5	73.3	M11	121.3	S5	160.6	M11	166.5
S6	116.2			S6	207.4
平均破裂压力	72.5	平均破裂压力	88.9	平均破裂压力	144.8	平均破裂压力	158.8

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表 3 渤海湾盆地渤南—四扣地区岩石样本破裂前后渗透率比较

Table 3. Comparison of permeability of rock samples before and after rupture, Bonan-Sikou area, Bohai Bay Basin

砂岩样本				泥页岩样本
样品编号	破裂前渗透率/ (10^-3 μm²)	破裂后渗透率/ (10^-3 μm²)	破裂后与破裂前渗透率之比	样品编号	破裂前渗透率/ (10^-3 μm²)	破裂后渗透率/ (10^-3 μm²)	破裂后与破裂前渗透率之比
S2a	3.310	4.700	1.42	M7a	0.031	8.650	279.03
S2b	0.572	2.240	3.92	M7b	0.003	0.058	20.71
S2c	1.400	2.130	1.52	M7c	0.012	1.270	105.83
S2d	0.252	0.295	1.17	M7d	0.004	0.005	1.35
S4a	0.018	0.256	14.22	M8a	0.800	11.652	14.57
S4b	0.007	1.250	178.57	M8b	0.009	19.530	2 100.00
S4c	0.014	0.462	33.00	M8c	0.095	2.900	30.53
S4d	0.004	0.009	2.10	M8d	0.011	4.195	381.36
平均值	0.700	1.420	29.49	平均值	0.121	4.576	366.67
注: a, b, c, d为采自同一块岩心的不同样品，其中a, c为平行地表方向采集的样品，b, d为垂直地表方向采集的样品。

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