滦平盆地白垩系细粒火山物质对页岩油气形成的影响

doi:10.11743/ogg20220212

Abstract

Abstract:

Industrial shale oil/gas flow was successfully tested in Well Luanye 1 after fracturing， and the Cretaceous Xiguayuan Formation in the Luanping Basin has currently been a key zone of hydrocarbon exploration and research in this area. Recent petrological studies on Well Luanye 1 show that fine-grained volcanic materials have been discovered in the source rocks and are closely related to the generation and accumulation of shale oil/gas. It has become a new proposition to explore the relationship between fine-grained volcanic materials and shale oil/gas. The lower member of Xiguayuan Formation in the Luanping Basin is the target of the study with a combination of analyses and laboratory data such as cores， microscopic thin sections observation， logging， X-ray diffraction and geochemical test. The sedimentary characteristics and organic matter development of the fine-grained tuffaceous sedimentary rocks are discussed to provide theoretical support for further exploration and development of shale oil/gas in the area. On the other hand， the development of lower member of Xiguayuan Formation is controlled by volcano-lacustrine interaction， with lacustrine shale， fine-grained tuffaceous sedimentary rocks under the effect of volcanic activities， as well as andesite and pyroclastic rocks of volcanic facies well developed within. The results show that in the shale， the average TOC content is 0.64 %， and the average S₁+S₂ content is 0.41 mg/g； in the fine-grained tuffaceous sedimentary rocks， the average TOC content is 1.92 %， and the average S₁+S₂ content is 2.64 mg/g， indicating that the abundance of organic matters is markedly greater in the fine-grained tuffaceous sedimentary rocks. Pyrite framboids are widely developed in the intervals where fine-grained volcanic materials are enriched； meanwhile， Pr/Ph is smaller and V/（V+Ni） is larger， also indicating a strong reduction of water environment after volcanic eruption. The rapid deposition and burial of fine-grained volcanic materials is conducive to the preservation of organic matters. Lacustrine carbonate rocks are well developed and interbedded with laminated organic-rich mudstone and tuff. The interlayer fractures are conducive to hydrocarbon migration， while the tuff and dolomite laminae provide reservoir spaces. The fine-grained volcanic materials play a positive role in the complete process from the enrichment and hydrocarbon generation of organic matters to the storage and preservation of oil/gas.

Key words: fine-grained volcanic material, rock type, shale oil/gas, Xiguayuan Formation, Cretaceous, Luanping Basin

CLC Number:

TE122.1

Xiaoning Liu, Zaixing Jiang, Xiaodong Yuan, Chen Chen, Cheng Wang. Influence of the Cretaceous fine-grained volcanic materials on shale oil/gas， Luanping Basin[J]. Oil & Gas Geology, 2022, 43(2): 390-406.

Figures/Tables 19

Fig.1

Fig.2

Table 1

Experiment on samples from Well Luanye 1， Luanping Basin"

样品编号	深度/m	岩性	岩石热解分析	镜质体反射率（R_o）	全岩衍射分析	有机碳稳定同位素	微量元素分析	样品编号	深度/m	岩性	岩石热解分析	镜质体反射率（R_o）	全岩衍射分析	有机碳稳定同位素	微量元素分析
1	704.30	泥页岩	√					35	985.30	粉砂质白云岩	√		√
2	704.67	泥页岩	√	√				36	992.85	粉砂岩	√	√	√	√	√
3	713.55	泥页岩	√					37	999.70	白云岩			√
4	713.75	泥页岩	√					38	1 005.70	白云质混合细粒岩					√
5	729.65	粉砂质泥页岩			√			39	1 013.15	粉砂岩	√		√
6	773.30	泥质粉砂岩		√	√	√		40	1 016.65	粉砂岩		√	√	√
7	777.50	泥质粉砂岩					√	41	1 022.68	白云岩			√
8	781.60	长英质混合细粒岩	√					42	1 028.20	粉砂质白云岩	√	√		√	√
9	782.50	长英质混合细粒岩	√					43	1 032.92	粉砂岩			√
10	798.00	泥页岩	√					44	1 041.50	粉砂岩	√		√	√
11	799.52	泥页岩	√					45	1 046.32	白云质粉砂岩	√	√
12	808.20	泥页岩	√					46	1 122.20	长英质混合细粒岩	√	√
13	808.56	泥页岩	√					47	1 122.88	长英质混合细粒岩	√			√
14	811.30	泥页岩	√		√			48	1 126.27	长英质混合细粒岩	√
15	822.16	泥页岩	√					49	1 126.27	长英质混合细粒岩	√
16	822.26	泥页岩	√					50	1 128.40	长英质混合细粒岩				√	√
17	831.40	长英质混合细粒岩					√	51	1 129.33	泥页岩	√
18	837.18	粉砂岩	√					52	1 129.80	长英质混合细粒岩	√			√
19	837.20	粉砂岩		√	√	√		53	1 135.20	粉砂质泥页岩	√
20	847.10	泥质粉砂岩	√		√			54	1 136.70	凝灰岩	√			√	√
21	868.17	粘土型混合细粒岩	√					55	1 136.73	凝灰岩	√
22	869.45	粘土型混合细粒岩	√					56	1 147.00	长英质混合细粒岩		√
23	877.73	长英质混合细粒岩	√					57	1 150.19	泥页岩	√
24	881.32	白云岩	√		√			58	1 153.67	粉砂质白云岩	√
25	911.36	白云质混合细粒岩	√					59	1 157.88	粉砂质白云岩				√	√
26	911.40	白云质混合细粒岩	√					60	1 167.12	粉砂质泥页岩	√	√
27	921.15	白云岩			√	√		61	1 173.01	粉砂质泥页岩	√
28	928.60	泥质粉砂岩					√	62	1 175.04	泥页岩	√
29	945.45	白云岩	√					63	1 175.80	泥页岩	√	√
30	947.30	白云岩	√					64	1 176.20	粉砂质泥页岩	√
31	956.80	粉砂岩	√		√			65	1 180.51	泥质粉砂岩	√
32	975.90	粉砂岩	√		√			66	1 243.90	长英质混合细粒岩					√
33	976.02	粉砂质泥页岩	√					67	1 249.25	粉砂岩			√
34	982.45	粉砂质白云岩	√	√	√	√		68	1 254.63	长英质混合细粒岩		√	√	√

Table 1

Fig.3

Table 2

Fig.4

Fig.5

Table 3

Table 4

Fig.6

Fig.7

Table 5

Fig.8

Fig. 9

Fig.10

Fig. 11

Fig.12

Fig.13

Table 6

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样品编号	井深/m	赤铁矿	硬石膏	方沸石	石英	钾长石	斜长石	方解石	铁白云石	白云石	黄铁矿	斜发沸石	粘土矿物总量
5	729.65	0	0.9	0	16.4	3.7	22.1	7.2	0	3.2	0	0	46.5
6	773.30	0	0	0	37.4	8.4	18.4	9.5	0	2.4	0	0	23.9
14	811.30	0.8	0	0	14.8	6.7	7.9	8.5	0	2.0	0	0	59.3
19	837.20	0	0	0	19.1	9.3	52.4	0.4	0	6.2	0	0	12.6
20	847.10	0	0	0	18.7	7.4	18.3	8.5	0	4.7	0.3	0	42.1
24	881.32	0	0	0	2.1	3.3	11.4	0.2	0	83.0	0	0	0
27	921.15	0	0	0	11.8	6.4	28.2	0.1	0	50.0	0	0	3.5
31	956.80	0	0	0	18.4	11.5	50.7	3.1	0	3.7	0.8	0	11.8
32	975.90	0	0	0	33.4	2.5	22.4	5.5	18.6	0	1.7	0	15.9
34	982.45	0	0	0	16.9	6.3	23.5	8.5	35.3	0	1.9	0	7.6
35	985.30	0	0	0.1	14.2	6.8	22.6	9.2	34.1	0	1.6	0	11.4
36	992.85	0	0	0	8.8	6.4	39.4	1.6	31.9	0	3.3	0	8.6
37	999.70	0	0	0	9.2	5.2	12.5	1.8	59.1	0	5.6	0	6.6
39	1 013.15	0	0	0	17.9	4.0	36.1	3.7	22.6	0	3.3	0	12.4
40	1 016.65	0	0	0	24.4	15.8	23.8	5.2	0	5.0	3.9	0	21.9
41	1 022.68	0	0	0	4.2	4.3	12.8	0.1	71.0	0	1.5	0	6.1
43	1 032.92	0	0	0	14.1	15.3	26.9	11.5	10.9	0	2.9	0	18.4
44	1 041.50	0	0	0	25.5	10.2	21.3	7.9	0	5.1	4.8	1.5	23.7
67	1 249.25	0	0	0	29.2	35.8	8.6	8.3	0	1.6	5.2	0	11.3
68	1 254.63	0	0	0	24.1	6.6	13.2	29.4	0	2.9	4.1	0	19.7

样品编号	深度/m	TOC/%	（S₁+S₂） /（mg·g^-1）	T_max/℃	样品编号	深度/m	TOC/%	（S₁+S₂） /（mg·g^-1）	T_max/℃
1	704.30	0.75	0.370 4	446.7	33	976.02	2.45	4.690 0	437.0
2	704.67	1.10	0.450 0	448.0	34	982.45	2.97	3.572 6	457.1
3	713.55	0.43	0.076 9	561.7	35	985.30	1.77	1.972 7	457.1
4	713.75	0.28	0.030 0	466.0	36	992.85	1.90	1.905 6	463.5
8	781.60	0.47	0.062 5	460.1	39	1 013.15	1.22	1.095 6	455.2
9	782.50	0.62	0.150 0	458.0	42	1 028.20	1.52	2.480 4	447.0
10	798.00	0.62	0.339 4	451.3	44	1 041.50	0.55	0.264 8	448.5
11	799.52	1.34	0.650 0	451.0	45	1 046.32	2.98	4.850 0	461.0
12	808.20	0.32	0.010 0	476.0	46	1 122.20	1.66	2.360 0	466.0
13	808.56	0.36	0.147 0	562.2	47	1 122.88	1.98	2.166 8	457.8
14	811.30	0.35	0.155 6	561.7	48	1 126.27	1.70	3.180 0	447.0
15	822.16	0.35	0.050 0	550.0	49	1 126.27	1.69	2.140 2	452.0
16	822.26	0.38	0.137 1	562.0	51	1 129.33	1.91	2.610 0	461.0
18	837.18	0.90	0.515 3	458.6	52	1 129.80	2.44	5.564 1	444.6
20	847.10	0.22	0.139 2	468.2	53	1 135.20	2.07	2.044 3	452.7
21	868.17	1.35	2.237 0	447.0	54	1 136.70	2.96	3.497 8	455.2
22	869.45	0.84	0.360 0	446.0	55	1 136.73	2.34	2.920 0	465.0
23	877.73	0.42	0.120 0	474.0	57	1 150.19	1.81	2.732 8	453.2
24	881.32	0.34	0.335 9	453.1	58	1 153.67	1.42	1.905 7	454.8
25	911.36	1.87	2.260 0	457.0	60	1 167.12	2.02	2.760 0	468.0
26	911.40	1.69	2.234 3	450.6	61	1 173.01	1.75	1.520 0	448.0
29	945.45	1.82	2.923 5	447.5	62	1 175.04	0.50	0.210 0	449.0
30	947.30	1.57	2.750 0	437.0	63	1 175.80	0.68	0.952 2	461.3
31	956.80	1.59	2.313 0	453.3	64	1 176.20	1.66	1.569 5	455.7
32	975.90	2.09	3.060 5	455.1	65	1 180.51	1.70	2.050 0	459.0

样品编号	深度/m	C₂₇甾烷含量/%	C₂₈甾烷含量/%	C₂₉甾烷含量/%
6	773.30	34.19	30.62	35.19
19	837.20	48.72	29.38	21.90
27	921.15	29.26	25.19	45.55
34	982.45	55.60	25.09	19.31
36	992.85	37.40	22.61	39.99
40	1 016.65	40.83	23.64	35.53
42	1 028.20	36.33	27.36	36.31
44	1 041.50	35.09	28.65	36.25
47	1 122.88	38.87	26.29	34.84
50	1 128.40	51.44	26.21	22.35
52	1 129.80	44.84	12.68	42.48
54	1 136.70	32.71	30.80	36.49
59	1 157.88	40.58	24.55	34.87
68	1 254.63	50.41	30.86	18.72

样品编号	深度/m	微量元素含量/（μg·g^-1）				V/（V+Ni）
样品编号	深度/m	Cr	Ni	V	Mo	V/（V+Ni）
7	777.50	63.58	26.53	83.30	0.49	0.76
17	831.40	63.12	29.57	90.22	0.70	0.75
28	928.60	190.41	42.14	128.24	0.65	0.75
36	992.85	58.89	26.61	75.96	36.10	0.74
38	1 005.70	94.45	31.79	82.97	11.95	0.72
42	1 028.20	35.39	23.96	63.78	8.18	0.73
50	1 128.40	49.37	25.88	78.83	4.74	0.75
54	1 136.70	81.59	30.82	96.07	1.60	0.76
59	1 157.88	54.13	25.87	80.13	27.15	0.76
66	1 243.90	49.99	27.56	97.20	14.42	0.78

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Influence of the Cretaceous fine-grained volcanic materials on shale oil/gas， Luanping Basin

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样品编号	深度/m	R_o/%
2	704.67	0.93
6	773.30	0.92
19	837.20	1.09
34	982.45	0.97
36	992.85	1.04
40	1 016.65	1.08
42	1 028.20	1.11
45	1 046.32	1.11
46	1 122.20	1.26
56	1 147.00	1.32
60	1 167.12	1.18
63	1 175.80	1.05
68	1 254.63	1.21