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

Abstract

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

CLC Number:

TE121

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.

Figures/Tables 10

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Table 1

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References 20

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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

Occurrence characteristics and exploration potential of Carboniferous shale gas in western Guizhou

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