黔西石炭系页岩气赋存特征与勘探潜力

doi:10.13809/j.cnki.cn32-1825/te.2022.01.007

摘要/Abstract

摘要：

为探索页岩气富集成藏特征与勘探潜力,以黔西下石炭统页岩为研究对象,基于2口调查井和2口探井资料重点从地层层序及沉积相、页岩赋存特征、成藏条件及有利区评价等方面进行剖析,研究表明：①黔西下石炭统页岩沉积受北西—南东向水城—紫云断裂控制和水城—六枝隆起构造影响,划分为威宁—水城沼泽—潟湖过渡相沉积区和水城—紫云浅水陆棚海相沉积区,形成威宁、紫云2个沉积中心,沉积厚度介于30~200 m,研究区威宁—水城页岩沉积厚度为119 m,底界埋深介于1 500~3 000 m,为勘探有利区;②受多期构造影响和同沉积控制,褶皱、断层共生组合控气成藏特征在该区较发育,为典型的逆断层封堵背斜组合构造控气成藏模式;③平面上,威水背斜与水城—紫云断裂所形成的构造作用带是威宁—水城区域下石炭统旧司组页岩气富集有利区,面积约为944 km²;垂向上,至少存在3套富有机质页岩含气层,具有较好的勘探潜力。

关键词: 石炭系, 过渡相, 页岩气, 赋存特征, 潜力评价

Abstract:

In order to explore the characteristics of rich accumulation and the exploration potential of transitional shale gas, the lower Carboniferous shale in southern Guizhou is taken as the research object. Based on the data of two investigation wells and two exploration wells, the analysis is conducted from the aspects of stratigraphic sequence and sedimentary facies, occurrence characteristics of shale, accumulation conditions and favorable area evaluation. The research result shows that: ① The lower Carboniferous shale deposits in western Guizhou are controlled by the NW-SE Shuicheng-Ziyun synsedimentary fault and the Shuicheng-Liuzhi uplift partition, which can be divided into weining shuicheng tidal flat lagoon-transition sedimentary facies and Shuicheng-Ziyun shallow-water shelf marine sedimentary facies, forming Weining and Ziyun depositional central areas with deposition thickness ranging from 30 m to 200 m. The sedimentary thickness of Weining-Shuicheng is 119 m, and the embedded depth of floor is between 1 500 m and 3 000 m, which is a favorable area for exploration. ② Influenced by multi-stage structure and controlled by syndeposition, the gas accumulation type controlled by the combination of folds and faults is relatively developed in this area, which is a typical gas accumulation mode controlled by the structure of anticlinal combination blocked by reverse fault. ③ On the plane, the accumulation zone of Weishui anticline and Shuicheng-Ziyun fault structure is a favorable exploration area for shale gas research in Weining-Shuicheng, the sedimentary center of Jiusi Formation, with an area of about 944 km². There are at least three sets of organic-rich shale gas bearing beds vertically in the shale, which have good exploration potential

Key words: carboniferous, transition, shale gas, occurrence characteristics, potential evaluation

中图分类号:

TE121

易同生,陈捷. 黔西石炭系页岩气赋存特征与勘探潜力[J]. 油气藏评价与开发, 2022, 12(1): 82-94.

Tongsheng YI,Jie CHEN. Occurrence characteristics and exploration potential of Carboniferous shale gas in western Guizhou[J]. Reservoir Evaluation and Development, 2022, 12(1): 82-94.

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采样地点	采样编号	采样层位	采样深度（m）	岩性	有机质成熟度（%）	有机碳含量（%）	孔隙度（%）	有机质类型	解吸含气量（m³/t）
威页1井	QXNWZ-60	C₁j	567.10~567.40	页岩	2.83	0.57	2.47	Ⅲ
	QXNWZ-67	C₁j	580.00~580.30	页岩	2.35	0.47
	QXNWZ-75	C₁j	609.10~609.40	页岩		0.68	2.79
	QXNWZ-85	C₁j	660.10~660.50	页岩	2.87	1.69		Ⅲ	0.61
	QXNWZ-91	C₁j	668.50~668.80	页岩		2.09	2.63
	QXNWZ-93	C₁j	676.35~676.75	页岩	2.69	1.58		Ⅱ₁	0.90
	QXNWZ-107	C₁j	713.82~714.22	页岩		1.09			0.49
	QXNWZ-111	C₁j	723.06~723.46	页岩	3.11	0.98		Ⅱ₂
	QXNWZ-117	C₁j	743.50~743.90	页岩		0.99			0.65
	QXNWZ-123	C₁j	760.52~760.89	页岩		1.70	2.76
	QXNWZ-130	C₁j	777.46~777.76	页岩		1.29			0.52
	QXNWZ-139	C₁j	790.16~790.41	页岩		0.98	2.25
水页1井	SY1-30	C₁j	560.95~561.10	页岩	2.3	1.47			0.15
	SY1-39	C₁j	625.81~626.46	页岩		1.09			0.70
	SY1-40	C₁j	632.01~632.61	页岩		1.10			1.03
	SY1-41	C₁j	643.50~643.93	页岩	3.82	0.74	2.82	Ⅱ₁	0.74
晴页2井	QY2-6	C₁j	677.12~677.51	页岩		2.55	3.21		1.95
	QY2-11	C₁j	683.00~683.37	页岩	4.02	3.53	3.76	Ⅱ₁
	QY2-12	C₁j	684.55~684.91	页岩		2.67			2.00
	QY2-15	C₁j	688.50~688.91	页岩		2.80	2.42		0
	QY2-28	C₁j	705.07~705.42	页岩	4.50	0.77	2.38	Ⅱ₁	1.61
	QY2-36	C₁j	716.60~716.94	页岩	4.87	1.57	2.04	Ⅱ₁	2.08
	QY2-44	C₁j	730.30~730.73	页岩	4.49	5.76	2.17	Ⅱ₁	2.35
页岩露头（六盘水市水城县）	2014-YY108	C₁j	地表	页岩	2.52	2.54
	2014-YY109	C₁j	地表	页岩	3.09	0.70	2.53	Ⅱ₁
	2014-YY110	C₁j	地表	页岩	2.29	0.91
	2014-YY111	C₁j	地表	页岩	2.96	0.87	2.14	Ⅱ₁

序号	采样编号	采样深度（m）	岩石名称	矿物组分（%）
				石英	长石	铁矿物	黏土矿物	碳酸盐	黏土矿物组分
				石英	长石	铁矿物	黏土矿物	碳酸盐	绿泥石	蒙脱石	伊利石	高岭石	伊蒙混层	间层比
1	QXNWZ-84	657.00	泥页岩	7.00	1.00	5.00	29.01	57.00	2.99	18.01	5.02	2.99	0	0
2	QXNWZ-85	659.20	页岩	19.93	0	2.43	20.61	56.48	2.80	0	15.57	2.24	21.18	15.00
3	QXNWZ-113	735.51	页岩	32.79	0	0.67	56.69	9.00	34.89	0	21.80	0	14.80	10.00
4	QXNWZ-121	756.26	页岩	45.00	1.00	1.00	51.00	1.00	13.01	19.99	14.99	3.01	0	0
5	QXNWZ-125	765.16	页岩	51.00	4.00	1.00	43.01	0	10.02	16.99	12.99	3.01	0	0
6	QXNWZ-129	776.96	页岩	67.00	1.00	1.00	30.00	0	7.98	8.01	12.00	2.01	0	0
7	QXNWZ-132	782.26	页岩	66.00	1.00	0	32.00	0	12.00	8.00	9.98	2.02	0	0
8	QXNWZ-136	786.55	页岩	65.00	2.00	0	32.00	0	9.98	8.00	12.00	2.02	0	0
9	QXNWZ-138	789.45	页岩	54.00	1.00	0	44.00	0	16.98	5.02	20.02	1.98	0	0
10	QXNWZ-140	790.31	页岩	56.00	2.00	0	41.00	0	18.00	2.99	17.02	2.99	0	0
11	QXNWZ-142	792.75	页岩	51.00	2.00	0	46.00	0	17.02	2.99	23.00	2.99	0	0