准噶尔盆地吉木萨尔凹陷致密油储层纳米孔隙特征及其含油性

靳军; 杨召; 依力哈木·尔西丁; 李璐璐; 刘明

doi:10.3799/dqkx.2018.415

准噶尔盆地吉木萨尔凹陷致密油储层纳米孔隙特征及其含油性

doi: 10.3799/dqkx.2018.415

中国石油新疆油田分公司实验检测研究院, 新疆克拉玛依 834000

基金项目:

国家科技重大专项"准噶尔盆地致密油形成条件、资源潜力及有利区优选" 210017553003

详细信息

作者简介:
靳军(1970), 男, 甘肃天水人, 博士, 教授级高工, 主要从事石油实验地质研究

通讯作者:
杨召

中图分类号: P618
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出版历程
- 收稿日期: 2018-04-30
- 刊出日期: 2018-05-15

Nanopore Characteristics and Oil-Bearing Properties of Tight Oil Reservoirs in Jimsar Sag, Junggar Basin

Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay 834000, China

摘要

摘要: 纳米技术在非常规油气致密储层微观孔隙结构表征、油气赋存等研究中发挥着重要的作用.以准噶尔盆地东部吉木萨尔凹陷二叠系芦草沟组致密油储层为例，综合运用高压压汞分析、场发射扫描电镜及纳米CT扫描等纳米分析技术，对吉木萨尔凹陷芦草沟组致密油储层微纳米孔隙特征与结构进行研究，并结合宏微观特征分析了原油在孔隙中的赋存状态.结果表明：吉木萨尔凹陷二叠系芦草沟组储层为中低孔、特低渗储层，孔隙以微纳米级为主，类型多样，主要有粒间孔（隙）、粒间溶孔、晶间孔及微裂隙等，纳米孔隙是吉木萨尔凹陷二叠系芦草沟组致密油储层主要储集空间之一，纳米孔隙中普遍含油，且多以吸附状态存在，赋存在纳米孔隙中的油气，改变了微米级孔隙是油气储层唯一微观孔隙的传统认识，是未来石油工业的发展方向.
- 纳米技术 /
- 芦草沟组 /
- 致密油储层 /
- 纳米孔隙 /
- 油气地质
Abstract: Nanotechnology plays an important role in the study of microscopic pore structure characterization and hydrocarbon accumulation in unconventional oil and gas tight reservoirs. This paper takes the tight oil reservoir of Permian Lucaogou Formation Jimsar sag in eastern Junggar basin as an example, comprehensively using high pressure mercury analysis, field emission scanning electron microscope (SEM) and nano CT scanning analysis technology to study micronano pore characteristics and structure of Lucaogou Formation tight oil reservoir in Jimsar sag. In addition, the occurrence state of crude in nanopores is analyzed combined with macro and micro characteristics. The results show that nanopore space is one of the main reservoir spaces in the Permian Lucaogou Formation tight oil reservoir in Jimsar sag of Junggar basin. On the whole, the main reservoir pore structure is micron and nano level, showing the characteristics of micron and nano pore throat. Nanopores are generally oil-bearing, and exist mostly in the adsorption state, which changes the traditiongal cognition that micron pore is the only microscopic pore in reservoir. It is the development direction of the future petroleum industry.
- nanotechnology /
- Lucaogou Formation /
- tight reservoir /
- nanometer pore /
- petroleum geology

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图 1 吉木萨尔凹陷岩石类型

a.显微照片(单偏光，2.5×)吉B井，3 044.84 m，砂屑云岩；b.显微照片(荧光，2.5×)吉A井，3 290.44 m，藻云岩；c.显微照片(单偏光，2.5×)吉A井，3 115.40 m，泥微晶云岩；d.显微照片(单偏光，1.25×)吉C井，3 271.74 m，凝灰质粉细砂岩；e.显微照片(正交偏光，2.5×)吉D井，3 271.74 m，灰质粉细砂岩；f.显微照片(单偏光，2.5×)吉B井，3 027.29 m，富有机质泥岩

Fig. 1. The map of the rock types in the Jimsar depression

下载: 全尺寸图片幻灯片

图 2 吉木萨尔凹陷二叠系芦草沟组纳米孔隙特征图

a.吉B井，3 152.82 m，微晶云岩，白云石晶间孔；b.吉A井，3 115.40 m，泥晶云岩，白云石晶间溶孔；c.吉B井，3 027.29 m，藻云岩，溶蚀孔；d.吉B井，3 297.75 m，灰质粉细砂岩，方解石晶内溶孔；e.吉C井，3 027.29 m，富有机质泥岩，有机孔；f.吉A井，3 290.44 m，藻云岩，有机孔

Fig. 2. Nanoporous characteristics of the Permian Lucaogou Formation in Jimsar depression

下载: 全尺寸图片幻灯片

图 3 吉木萨尔凹陷二叠系芦草沟组覆压孔隙度、渗透率分布

Fig. 3. Cushion porosity and permeability of the Permian Lucaogou Formation in Jimsar depression

下载: 全尺寸图片幻灯片

图 4 吉C井吉木萨尔凹陷二叠系芦草沟组孔喉分布直方图

Fig. 4. Distribution of pore and throat distribution in the Permian Lucaogou Formation in Jimsar depression of Ji C Well

下载: 全尺寸图片幻灯片

图 5 吉木萨尔凹陷二叠系芦草沟组压汞曲线特征图

Fig. 5. Mercury penetration curves of the Permian Lucaogou Formation in Jimsar depression

下载: 全尺寸图片幻灯片

图 6 吉A井3 271.74 m含凝灰质藻云岩孔喉半径分布直方图

Fig. 6. Distribution of pore-throat radius distribution histograms of algae and limestone rocks of Ji A well 3 271.74 m

下载: 全尺寸图片幻灯片

图 7 吉C井云质粉细砂岩富含油岩心照片

Fig. 7. Rock photos rich in oil core cloudy fine sandstone of Ji C well

下载: 全尺寸图片幻灯片

图 8 吉C井场发射扫描电镜下析出的油膜及油膜能谱分析图

Fig. 8. Analysis of oil film and oil film energy spectrum precipitated by field emission scanning electron microscopy of Ji C well

下载: 全尺寸图片幻灯片

图 9 云质粉砂岩岩心滴酸放置一定时间后含油情况变化

Fig. 9. Changes in oil content after a certain period of time cloudy siltstone

下载: 全尺寸图片幻灯片

表 1 芦草沟组“上、下甜点”段压汞参数

Table 1. Mercury injection parameters for the upper and lower dessert sections of Lucaogou Formation

甜点体	孔隙体积(μm³)	有效孔隙度(%)	渗透率(mD)	均值	分选系数	偏态	峰态	变异系数	中值压力(MPa)	中值半径(μm)	排驱压力(MPa)	最大孔喉半径(μm)	退汞效率(%)	孔喉体积比	平均毛管半径(μm)	均质系数	非饱和孔隙体积百分数(%)
上甜点	1.367	12.029	0.177	13.059	2.108	0.762	2.393	0.165	29.308	0.073	4.064	0.789	24.359	3.428	0.237	0.230	16.831
下甜点	1.147	10.398	0.152	13.407	1.972	0.746	2.327	0.149	29.935	0.043	4.053	0.435	20.119	4.710	0.131	0.223	18.371

下载: 导出CSV

表 2 芦草沟组CT定量表征参数

Table 2. CT quantitative characterization parameter of Lucaogou Formation

体积	孔隙度(%)	14.680	6.490	16.860	2.692	4.380
	孔喉体积(μm³)	5.948	3.067×10⁷	8.004×10⁷	1.192×10⁷	2.070×10⁷
	连通体积(μm³)	3.190 占总体积的的53.63%	2.459×10⁷ 占总体积的的80.17%	7.742×10⁷ 占总体积的 96.73%	2.477×10⁶ 占总体积的的20.78%	3.150×10⁶ 占总体积的的15.22%
孔隙	数量	349	3 045	4 040	8 714	19 465
	体积(μm³)	5.084	2.704×10⁷	7.097×10⁷	1.010×10⁷	1.795×10⁷
	半径(nm)	平均：71 最小：7 最大：366	平均：4.934 最小：0.551 最大：55.070	平均：4.978 最小：0.477 最大：78.94	平均：2.704 最小：0.467 最大：24.68	平均：2.642 最小：0.456 最大：26.18
	连通性	3.0407	5.260	4.816	2.822	1.843
喉道	数量	489	8 453	10 394	12 118	17 470
	体积(μm³)	0.864	3.636×10⁶	9.075×10⁶	1.822×10⁶	2.751×10⁶
	半径(nm)	平均：47 最小：5 最大：157	平均：4.102 最小：0.450 最大：39.070	平均：4.347 最小：0.453 最大：57.46	平均：2.351 最小：0.45 最大：14.62	平均：2.227 最小：0.434 最大：14.44

下载: 导出CSV

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