基于CT成像的白云岩储层孔喉非均质性分析——以塔东古城地区奥陶系GC601井鹰三段为例

doi:10.11743/ogg20200418

Abstract

Abstract:

The pore-throat heterogeneity of dolomite reservoirs is mainly reflected by their complex structure and distribution that are difficult to sufficiently and quantitatively analyze with conventional reservoir characterization methods.In this study, nine samples from dolomite reservoirs in the 3rd member of the Ordovician Yingshan Formation (Ying 3 member), Gucheng area, eastern Tarim Basin, were CT scanned to establish a 3D network model for the pore-throats.Such reservoir parameters as pore-throat radius, pore and throat numbers, total porosity, spatial connectivity, and etc., were calculated based on the model.The results show obvious differences among the pore-throat radius distribution curves for the samples.These curves can then be grouped into three categories in terms of shape features, that is, Type Ⅰ, the normal unimodal curve; Type Ⅱ, the unimodal curve for pores and multi-modal curve for throats; and Type Ⅲ, the multi-modal curve for both pores and throats.The genesis of the curves was analyzed and pore-throat radius distribution patterns were set up based on core observation and casting thin section identification of the samples.In conclusion, the pore-throat radius distribution curves for dolomite reservoirs dominated by intra-crystalline pores are generally evenly skewed unimodal distribution, except for some tinny peaks beside the main summits caused by the development of local micro-fractures.The curves may show obvious multiple summits with pores converging along some residual sedimentary structures such as bedding surfaces.All the curves may show the multi-modal distribution with increasing numbers of inter-crystalline dissolved pores under stronger dissolution that indicates high heterogeneity of reservoirs.

Key words: CT imaging technology, pattern of pore-throat radius distribution, pore-throat heterogeneity characterization, dolomite reservoir, Yingshan Formation, Tarim Basin

CLC Number:

TE122.2

Kedan Zhu, You Zhang, Tong Lin, Yachun Wang, Xingping Zheng, Lin Zhu. Pore-throat heterogeneity in dolomite reservoirs based on CT imaging: A case study of the 3rd member of the Ordovician Yingshan Formation in Well GC601 in Gucheng area, eastern Tarim Basin[J]. Oil & Gas Geology, 2020, 41(4): 862-873.

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样品编号	柱塞直径/mm	岩性	孔隙类型	主要镜下结构特征
Ⅰ	25	浅灰色细-中晶白云岩	晶间孔和少量裂缝	白云石晶体半自形-自形,晶间孔多被渗流粉砂充填
Ⅱ	25	浅灰色细-中晶白云岩	晶间孔和裂缝	白云石晶体它形-半自形,残余颗粒结构,晶间孔边缘存在溶蚀现象,局部见微裂缝
Ⅲ	25	浅灰色中晶白云岩	晶间溶孔和裂缝	白云石晶体半自形-自形,残余颗粒结构,晶间孔边缘存在溶蚀现象,亮晶方解石充填孔洞
Ⅳ	25	灰色细晶白云岩	少量晶间孔	白云石晶体半自形-自形,晶间孔多被黑色泥质充填,残余颗粒结构
Ⅴ	25	浅灰色细-中晶白云岩	晶间孔和裂缝	白云石晶体它形-半自形,残余颗粒结构,较多晶间孔被黑色泥质充填
Ⅵ	25	岩溶浅灰色中晶白云岩	晶间孔和少量裂缝	白云石晶体半自形-自形,残余颗粒结构,晶间孔边缘存在溶蚀,部分晶间孔被黑色泥质充填
Ⅶ	25	浅灰色细晶白云岩	晶间孔和溶蚀孔洞	白云石晶体半自形-自形,残余颗粒结构,晶间孔多被黑色泥质充填,有溶蚀现象
Ⅷ	15	浅灰色中晶白云岩	晶间孔和溶蚀孔洞	白云石晶体半自形-自形,残余颗粒结构,晶间孔边缘存在溶蚀现象
Ⅸ	25	花斑状浅灰色中晶白云岩	晶间孔和少量裂缝	白云石晶体半自形-自形,自形程度有渐变趋势,晶间孔有溶蚀现象,残余颗粒结构

样品编号			Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ	Ⅵ	Ⅶ	Ⅷ	Ⅸ
样品	分辨率/μm		8	8	8	8	8	8	8	6	8
	定量计算区体积/ (10⁹ μm³)		226.98	262.14	314.43	250.04	226.98	287.50	274.63	456.53	287.50
	孔隙度/%		3.48	10.07	6.29	0.73	2.06	2.40	5.03	3.68	2.71
	连通体积百分比/%		36.33	99.61	99.87	79.18	44.08	24.05	79.05	51.40	30.62
孔隙	数量/个		14 707	14 391	9 530	3 461	7 644	5 927	3 595	1 221	6 506
	体积/(10⁶ μm³)		2 867	9 562	7 121	8 916	1 873	2 809	5 405	2 446	3 066
	半径/μm	平均	18.45	28.90	24.31	13.66	17.06	20.67	27.42	39.06	20.08
		最小	3.53	3.88	3.74	2.78	3.66	3.60	3.38	3.06	3.41
		最大	63.29	156.50	445.90	46.59	98.86	143.00	401.70	180.60	187.60
喉道	数量/个		20 060	18 020	14 193	552	4 696	2 897	4 390	1 215	4 357
	体积/(10⁶ μm³)		1 164.2	3 817.9	2 970.2	35.8	510.8	683.5	1 654.0	1 192.2	892.0
	半径/μm	平均	13.40	19.12	23.37	10.18	12.42	19.33	34.25	28.86	17.40
		最小	3.26	3.13	3.19	2.64	3.49	3.48	3.21	3.07	3.24
		最大	55.76	102.00	216.50	32.26	71.98	89.08	276.20	136.40	103.30

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Pore-throat heterogeneity in dolomite reservoirs based on CT imaging: A case study of the 3rd member of the Ordovician Yingshan Formation in Well GC601 in Gucheng area, eastern Tarim Basin

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