南川地区栖霞—茅口组碳酸盐岩储集空间研究

doi:10.13809/j.cnki.cn32-1825/te.2021.02.008

摘要/Abstract

摘要：

中二叠统栖霞—茅口组碳酸盐岩是四川盆地天然气勘探开发重点层系之一。南川地区位于四川盆地东南缘,前期勘探表明南川地区栖霞—茅口组具有较大天然气开发潜力。为明确南川地区中二叠统栖霞—茅口组碳酸盐岩储集空间特征,基于JY205-2井岩心样品,采用薄片鉴定、扫描电镜实验、X射线衍射分析等测试手段,对储集空间进行分类研究。将储集空间分为孔隙和裂缝2大类,其中孔隙包括无机孔和有机孔;裂缝包括应力缝、粒缘缝、收缩缝。储集空间类型受岩性控制明显,栖霞—茅口组碳酸盐岩储层占主导地位的储集空间类型为粒内溶蚀孔和粒缘溶蚀缝,粒缘溶蚀缝具有较好的孔缝连通作用,有利于改善储层渗透率,其中泥质含量较高层段可见较丰富的黏土矿物晶间孔。茅一段①小层粒内溶蚀孔和黏土矿物晶间孔面孔率数值最高,与该段较高的孔隙度、渗透率数值吻合较好,认为茅一段①小层是该区天然气勘探有利层位。

关键词: 栖霞—茅口组碳酸盐岩, 储集空间, 孔隙, 裂缝, 南川地区

Abstract:

Middle Permian Qixia-Maokou Formation is one of the most important series of strata to explore and develop natural gas in Sichuan Basin. Nanchuan area is located in the southeast of Sichuan Basin. The pilot exploration indicates that there is a great development potential for natural gas in Qixia-Maokou Formation. In order to know its reservoir spaces of carbonate rocks, the test methods, such as thin section identification, SEM and phase analysis of X-ray diffraction, have been taken based on the samples of Well-JY205-2. The reservoir spaces are classified into two categories: pores and fractures. Pores include organic pores and inorganic pores, while fractures include stress fractures, grain edge fractures and shrinkage cracks. The types of reservoir spaces are obviously controlled by lithology. In Qixia-Maokou Formation, the dominant reservoir space types of carbonate reservoirs are the intragranular dissolution pores and the dissolution fractures distributed along the particle edge. These dissolution fractures can connect the pores with the fractures better, and are beneficial to improve the permeability of the reservoir. There are abundant intercrystalline pores of clay minerals in the layers with higher argillaceous content. The surface porosity of intragranular dissolution pores and intercrystalline pores of clay minerals in the layer-① of Mao-1 Member are the highest and in good agreement with the higher porosity and permeability in this layer, which indicates that the layer-① of Mao-1 Member is favorable to natural gas exploration.

Key words: carbonate rocks in Qixia-Maokou Formation, reservoir spaces, pore, fracture, Nanchuan area

中图分类号:

TE122

夏威,蔡潇,丁安徐等. 南川地区栖霞—茅口组碳酸盐岩储集空间研究[J]. 油气藏评价与开发, 2021, 11(2): 197-203.

Wei XIA,Xiao CAI,Anxu DING, et al. Reservoir spaces of carbonate rocks in Qixia-Maokou Formation of Nanchuan area[J]. Reservoir Evaluation and Development, 2021, 11(2): 197-203.

图/表 6

图1

图2

表1

南川地区JY205-2井部分样品实验数据"

序号	层位		岩性	深度（m）	石英（%）	长石（%）	方解石（%）	白云石（%）	黄铁矿（%）	黏土矿物（%）	TOC （%）	镜质体反射率（%）	脉冲渗透率（10^-3μm²）	有效孔隙度（%）
1	茅二段		生屑灰岩	1 020.00	1.3	0	88.6	4.5		5.6	0.24
2				1 025.27	0.9	0	93.2	0		5.9	0.16
3				1 035.71	0.1	0	93.7	2.2		4.0	0.42		0.001 317 5	0.918
4				1 038.23	1.1	0	91.7	3.2		4.0	0.24
5	茅一段	③小层	生屑灰岩、泥质生屑、灰岩	1 160.00	5.0	0.6	70.4	2.3		20.9	1.70	2.31	0.390 706 0	2.020
6				1 162.04	1.6	0	78.6	2.9		13.6	0.56		0.000 853 0	1.187
7				1 164.50	0.8	0.6	84.0	2.4		11.6	0.57		0.000 083 9	0.962
8				1 165.84	7.5	0.5	77.9	2.4	0.2	11.1	1.39
9				1 166.75	3.9	0	86.0	5.1		4.6	0.35	2.11	0.003 794 5	0.707
10				1 170.78	3.0	0	81.3	2.7		10.3	0.34		0.050 424 5	1.121
11	茅一段	②小层	生屑灰岩	1 180.06	0.4	2.3	91.8	2.6		2.9	0.22		0.000 254 9	0.627
12				1 183.74	0.3	0.4	92.0	1.1	0.2	6.0	0.48		0.105 983 8	0.558
13				1 185.46	0.2	1.0	82.3	12.3	0.2	4.0	1.27	2.42	0.001 089 9	1.469
14				1 186.58	0.5	0.6	91.3	3.6		4.0	1.16
15	茅一段	①小层	生屑灰岩、泥质灰岩夹、灰质云岩	1 187.61	0.6	0.7	94.3	0		4.4	0.44		0.000 118 5	0.701
16				1 192.57	6.0	0.7	59.3	5.4		26.8	0.77		0.025 243 2	1.562
17				1 194.55	15.4	0.4	47.8	2.0	0.1	31.9	0.71		0.233 938 3	1.978
18				1 201.16	8.5	1.0	70.0	5.2	0.3	13.9	1.25		0.332 262 7	3.474
19				1 203.12	0.5	0	94.1	0		5.1	0.24		0.000 660 4	0.548
20				1 211.35	13.9	0.7	60.2	0	0.8	16.7	0.88	2.16	0.015 909 9	3.501
21				1 215.34	6.5	0	48.3	0		25.6	0.79	2.69	0.680 529 0	1.202
22				1 216.51	8.0	0	81.9	0	0.6	9.5	1.00
23				1 219.31	1.0	0	56.2	0.4	0.2	15.6	0.65		0.000 430 1	0.405
24				1 221.40	4.9	0	77.6	1.3	0.2	11.0	0.33	2.78	0.007 055 8	0.712
25				1 223.91	9.1	0	47.6	1.5	0.2	24.1	0.9		0.003 499 1	1.991
26				1 226.37	10.1	0	54.8	8.6		16.4	0.53		0.022 856 2	3.508
27				1 231.02	4.0	0	83.5	0		10.8	0.45		0.002 030 8	1.446
28				1 233.14	7.9	0	24.6	49.2	0.2	8.9	0.60		0.001 954 9	2.245
29				1 235.12	15	0	78.8	0	0.2	6.0	0.79		0.011 419 9	1.903
30	栖霞组		生屑灰岩、灰质云岩	1 236.12	5.1	0	88.7	2.3		3.9	0.10
31				1 236.91	0.8	0.7	93.4	1.1		4.0	0.08		0.003 380 3	0.480
32				1 242.16	0.4	1	88.1	3.4	0.3	6.8	0.37		0.000 739 3	0.411
33				1 243.81	3.4	0	67.0	24.3		5.3	0.28		0.000 684 3	0.375
34				1 246.10	0.7	0	93.8	2.9		2.6	0.13		0.006 126 0	0.754
35				1 247.44	3.6	0.6	43.0	50.3	0.1	2.4	0.44		0.000 555 0	0.731

表1

图3

图4

图5

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