基于沉积微相-储集空间类型的储集层流动单元划分——以彭州气田雷口坡组碳酸盐岩储集层为例

doi:10.7657/XJPG20200408

摘要/Abstract

摘要：

沉积微相和储集空间类型分别从不同的角度反映了储集层的非均质性。四川盆地川西坳陷彭州气田中三叠统雷口坡组四段上亚段缝洞型碳酸盐岩储集层具有很强的非均质性,采用沉积微相-储集空间类型定性识别与流动层带指数定量划分相结合的方法,优选参数并利用聚类分析将彭州气田雷四上亚段缝洞型碳酸盐岩有效储集层划分为4类流动单元,不同类型流动单元与沉积微相、物性特征、储集空间类型具有很好的对应性。用典型岩心的压汞曲线对分类结果进行验证,揭示该方法对缝洞型碳酸盐岩储集层具有较好的分类效果。Ⅰ类和Ⅱ类流动单元具有相对优质的储渗条件和含气性,是彭州气田雷四上亚段缝洞型碳酸盐岩优质储集层评价的主要类型。

关键词: 四川盆地, 彭州气田, 雷口坡组, 碳酸盐岩储集层, 缝洞型储集层, 沉积相, 流动单元划分

Abstract:

Sedimentary microfacies and reservoir space types reflect reservoir heterogeneity from different perspectives. The fractured-vuggy carbonate reservoir in the upper Leisi member of the Middle Triassic Leikoupo formation in Pengzhou gas field of the Chuanxi depression, Sichuan basin is highly heterogeneous. Based on qualitative identification of sedimentary microfacies-reservoir space type and quantitative division of flow zone index, the effective reservoir of the fractured-vuggy carbonate in the upper Leisi member of Leikoupo formation in Pengzhou gas field can be divided into four types of flow units through cluster analysis of optimal parameters, and different types of flow units can well correlate with sedimentary microfacies, physical properties and reservoir space types. The division is verified with typical core mercury injection curves and the results indicates that the method is practical for fractured-vuggy carbonate reservoirs. The type Ⅰ and type Ⅱ flow units have good storage capability, permeability and gas-bearing property, which are the main high-quality fractured-vuggy carbonate reservoirs in the upper Leisi member of Pengzhou gas field.

Key words: Sichuan basin, Pengzhou gas field, Leikoupo formation, carbonate reservoir, fractured-vuggy reservoir, sedimentary facies, flow unit division

中图分类号:

TE112.23

何传亮, 康建云, 王辛, 张世懋. 基于沉积微相-储集空间类型的储集层流动单元划分——以彭州气田雷口坡组碳酸盐岩储集层为例[J]. 新疆石油地质, 2020, 41(4): 435-443.

HE Chuanliang, KANG Jianyun, WANG Xin, ZHANG Shimao. Reservoir Flow Unit Division Based on Sedimentary Microfacies-Reservoir Space Type: A Case of Carbonate Reservoir of Leikoupo Formation in Pengzhou Gas Field[J]. Xinjiang Petroleum Geology, 2020, 41(4): 435-443.

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储集空间		裂缝或孔隙直径/mm	成岩作用	岩性
溶洞	孔洞	2.00~15.00	溶蚀作用	藻粘结白云岩
裂缝	构造缝	0.10~1.00	构造作用	灰岩,灰质白云岩
裂缝	溶蚀微裂缝	0.01~0.10	构造作用	灰岩,灰质白云岩
孔隙	不规则溶孔	0.01~1.00	溶蚀作用	（残余）藻粘结白云岩,藻纹层白云岩
	晶间溶孔	0.05~0.40	溶蚀作用	微—细晶白云岩,残余藻结构白云岩
	晶间孔	0.01~0.05	沉积作用	微—细晶白云岩,微—细晶含灰白云岩
	粒间溶孔	0.12~0.60	沉积溶蚀作用	微—细晶白云岩,残余藻结构白云岩
	铸模孔	0.01~1.00	次生作用、成岩作用	膏白云岩,含膏白云岩,藻砂屑灰岩

流动层带指数	储集层特征	储集层类型
>13.9	低孔高渗	裂缝型
8.5~13.9	中—低孔高渗	裂缝-孔隙型
1.0~8.5	中孔中渗、特低孔特低渗	孔隙型、基岩
≤1.0	中—低孔特低渗	孤立孔隙型

流动单元分类	样品数/个	渗透率/mD	孔隙度/%	流动层带指数
Ⅰ类	48	0.59~80.20（8.26）	2.3~9.4（3.4）	3.70~15.83（8.89）
Ⅱ类	92	0.01~13.82（1.40）	2.2~19.8（5.4）	0.59~5.57（1.96）
Ⅲ类	62	0.02~65.40（6.03）	0.3~3.4（1.4）	5.11~144.69（32.04）
Ⅳ类	92	0~0.20（0.03）	2.0~9.2（4.2）	0.12~0.98（0.55）
Ⅴ类	94	0~0.09（0.01）	0.5~2.0（1.2）	0.46~8.50（2.66）

流动单元分类	沉积微相	岩性	平均孔隙度/%	平均渗透率/mD	孔渗特征	储集空间类型
Ⅰ类	云坪	藻白云岩、白云岩	3.4	8.26	中—低孔高渗	裂缝、溶蚀孔洞
Ⅱ类	藻云坪、含灰云坪	藻粘结白云岩、含灰白云岩	5.4	1.40	中—高孔中渗	粒间溶孔、晶间溶孔
Ⅲ类	灰云坪、藻灰坪	灰岩、灰质白云岩	1.4	6.03	低孔高渗	构造缝、溶蚀缝
Ⅳ类	含藻云坪、藻屑滩、藻云灰坪	残余藻粘结白云岩、藻纹层白云岩、微—细晶白云岩	4.2	0.03	中—低孔低渗	不规则溶孔、孤立溶孔
Ⅴ类	灰坪、含云灰坪、藻灰坪	灰岩、含白云灰岩	1.2	0.01	极低孔极低渗