陆相页岩游离油定量表征及其影响因素

doi:10.11743/ogg20230409

Abstract

Abstract:

The lacustrine shale samples were selected from the second member of the Funing Formation in Gaoyou Sag， Subei Basin， to precisely and quantitatively evaluate the free oil content and its controlling factors of lacustrine shale. The mineral composition， hydrocarbon generation capacity， pore structure， oil-bearing properties， and other characteristics of the samples were analyzed using X-ray diffraction tests， TOC content measurement， multistep rock-eval pyrolysis， high pressure mercury injection， organic matter extraction and 2D NMR. The results show that the shale is rich in quartz， feldspar， calcite， dolomite， clay， and other minerals. The TOC is between 0.61 % and 3.70 %. The R_o is between 0.70 % and 0.72 %， indicating the source rocks being in the mature stage. The reservoir space is mainly composed of intergranular and organic pores. Two-dimensional NMR， which can efficiently detect and characterize the occurrence of free oil， was employed to help extracting free light and heavy hydrocarbons as well as soluble organic matter from the samples， and performing spectra analysis before and after the extraction， on which light oil zone， solid organic matter zone， hydroxyl compound zone， and water zone were identified. Post-extraction solid organic matter content was found to have a good correlation with TOC. Pre-extraction NMR-based light hydrocarbon content and NMR-based differential light hydrocarbon content between pre-extraction and post-extraction show a relatively strong linear connection with pyrolysis free oil content. The free oil content rises initially and then fall as the felsic mineral content rises， and it is positively correlated with TOC as a whole. The free oil contents in type Ⅰ and Ⅱ₁ kerogen source rocks are higher than those of other kinds. The right degree of thermal evolution of source rocks increases the ratio of light hydrocarbons and mobility of kerogen-generated hydrocarbons， as well as free oil content. Shale reservoirs with high porosity， specific pore volume， and median value of pore throat radius are conducive to free oil enrichment.

Key words: free oil content, nuclear magnetic resonance, Funing Formation, lacustrine shale, Gaoyou Sag, Subei Basin

CLC Number:

TE122.1

Tian LIU, Xiaoping LIU, Qidong LIU, Hongliang DUAN, Shili LI, Biao SUN, ZuXian HUA. Quantitative characterization and influencing factors of free oil content in lacustrine shale： A case study of Funing Formation in the Gaoyou Sag， Subei Basin[J]. Oil & Gas Geology, 2023, 44(4): 910-922.

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样品编号	岩性	深度/m	矿物成分含量/%
样品编号	岩性	深度/m	黏土矿物	石英	长石	方解石	白云石
S-1	黏土质页岩	3 119.35	54.89	25.05	9.15	7.07	3.85
S-2	长英质页岩	3 120.49	9.39	41.41	27.07	12.32	9.80
S-3	混合质页岩	3 121.92	40.66	33.78	14.68	5.03	5.85
S-4	混合质页岩	3 123.95	41.21	23.74	11.61	10.46	12.97
S-5	混合质页岩	3 128.17	33.47	30.47	11.71	0.41	23.94
S-6	混合质页岩	3 129.82	35.03	25.28	18.24	18.13	3.32
S-7	混合质页岩	3130.61	48.09	27.61	8.58	7.14	8.58
S-8	碳酸盐质页岩	3 131.00	21.13	14.46	3.74	18.60	42.06
S-9	长英质页岩	3 132.90	28.90	34.69	25.66	0.71	10.04
S-10	混合质页岩	3 133.47	32.86	26.16	8.11	1.84	31.03
S-11	长英质页岩	3 136.02	37.58	23.15	27.86	9.02	2.40
S-12	混合质页岩	3 143.99	31.81	29.42	9.45	9.55	19.76
S-13	混合质页岩	3 149.35	28.87	34.80	15.37	0.99	19.98
S-14	碳酸盐质页岩	3 151.69	15.87	16.18	8.09	16.29	43.57
S-15	混合质页岩	3 161.54	25.84	20.56	12.70	5.96	34.94
S-16	混合质页岩	3 161.87	39.90	22.60	8.77	9.98	18.75
S-17	碳酸盐质页岩	3 162.41	15.79	9.34	5.26	11.60	58.00
S-18	混合质页岩	3 164.93	12.64	28.74	17.45	1.46	39.71
S-19	混合质页岩	3 166.93	21.45	21.23	13.53	28.05	15.73
S-20	混合质页岩	3 357.24	43.27	23.27	10.61	15.82	7.04
S-21	混合质页岩	3 128.47	35.71	25.94	10.38	16.38	11.60
S-22	混合质页岩	3 119.12	18.57	35.12	4.04	41.27	1.01
S-23	混合质页岩	3 114.42	41.37	30.92	8.48	5.17	14.06
S-24	混合质页岩	3 125.07	45.95	32.02	13.62	1.56	6.86
S-25	碳酸盐质页岩	3 128.84	10.20	19.09	0.91	1.82	67.98
S-26	混合质页岩	3 127.68	33.47	30.47	11.71	0.41	23.94
S-27	碳酸盐质页岩	3 129.11	27.23	13.26	3.54	5.36	50.61
S-28	混合质页岩	3 131.49	38.38	32.04	11.16	7.78	10.64
S-29	黏土质页岩	3 124.39	55.39	27.02	8.59	4.29	4.71
S-30	黏土质页岩	3 124.79	56.15	26.68	10.34	1.96	4.86

样品编号	TOC/%	S₁/（mg/g）	S₂/（mg/g）	T_max/℃	R_o/%	样品编号	TOC/%	S₁/（mg/g）	S₂/（mg/g）	T_max/℃	R_o/%
S-1	1.30	0.65	3.26	418	0.705	S-16	1.14	0.74	5.36	447	—
S-2	0.61	0.19	0.45	422	—	S-17	0.90	0.71	2.50	440	—
S-3	1.21	0.60	1.75	414	0.713	S-18	1.24	1.21	5.98	438	—
S-4	0.93	1.32	6.36	445	0.702	S-19	1.52	1.44	7.29	450	0.715
S-5	1.32	0.96	6.61	406	—	S-20	0.68	0.35	1.85	456	0.713
S-6	1.72	0.83	7.09	415	—	S-21	3.70	2.43	14.24	440	—
S-7	1.60	1.01	5.37	424	—	S-22	2.49	1.19	9.30	439	—
S-8	0.78	1.22	2.27	422	—	S-23	2.21	1.68	13.10	414	0.714
S-9	0.72	0.43	1.23	408	0.713	S-24	1.40	1.11	5.08	407	—
S-10	0.77	0.43	1.27	402	—	S-25	2.39	0.68	11.43	432	0.720
S-11	1.36	0.97	5.00	449	0.712	S-26	1.32	0.96	5.05	406	—
S-12	1.31	1.28	5.42	429	0.708	S-27	2.04	1.08	10.92	424	—
S-13	1.26	1.08	3.20	431	—	S-28	0.96	1.02	5.32	422	—
S-14	1.02	0.80	1.32	424	0.706	S-29	1.71	0.62	4.69	402	—
S-15	1.97	0.63	3.69	440	0.705	S-30	1.48	0.77	4.68	407	—

样品编号	孔隙度/%	比孔体积/（cm³/g）	孔喉半径均值/nm
S-4	7.44	0.036	14.68
S-5	8.24	0.047	15.52
S-10	8.09	0.042	15.43
S-11	9.20	0.045	15.88
S-13	9.03	0.036	16.88
S-14	4.43	0.023	14.47
S-15	7.26	0.045	16.33
S-16	7.64	0.037	15.37
S-18	7.34	0.038	15.43
S-19	5.87	0.029	14.81
S-20	5.57	0.024	14.47

样品编号	K_恢复	含油量/（mg/g）					样品编号	K_恢复	含油量/（mg/g）
样品编号	K_恢复	S_1冷冻	S_1-1	S_1-2	S_2-1	游离油量	样品编号	K_恢复	S_1冷冻	S_1-1	S_1-2	S_2-1	游离油量
S-1	1.35	0.88	0.41	1.13	2.71	1.77	S-16	3.61	2.67	0.93	2.79	2.04	5.65
S-2	2.89	0.55	0.18	0.81	1.29	1.35	S-17	1.52	1.08	0.29	1.26	1.27	1.92
S-3	2.27	1.36	0.54	1.53	2.03	2.83	S-18	1.98	2.39	0.66	2.51	1.72	4.35
S-4	1.83	2.41	0.54	1.88	1.92	3.51	S-19	1.66	2.39	0.51	3.24	1.29	4.70
S-5	1.81	1.74	0.66	2.05	1.51	3.49	S-20	1.80	0.63	0.21	0.69	2.3	1.17
S-6	4.61	3.83	0.93	3.26	2.53	7.19	S-21	1.91	4.64	1.18	4.02	1.28	7.41
S-7	2.00	2.00	0.94	1.98	2.60	3.92	S-22	2.71	3.23	0.73	3.02	1.72	5.79
S-8	1.29	1.57	0.47	1.94	1.40	2.76	S-23	1.40	2.35	0.60	3.24	3.49	4.51
S-9	2.12	0.91	0.18	0.98	1.28	1.64	S-24	2.36	2.62	0.53	2.29	2.55	4.33
S-10	1.95	0.84	0.30	1.05	1.96	1.76	S-25	2.97	2.02	0.71	2.20	0.95	4.25
S-11	2.87	2.78	0.42	2.36	1.76	4.59	S-26	1.81	1.74	0.66	2.05	2.29	3.49
S-12	1.74	2.23	0.80	2.93	1.41	4.68	S-27	1.81	1.95	0.57	1.98	2.06	3.42
S-13	2.45	2.65	1.00	2.64	2.37	5.21	S-28	1.82	1.86	0.72	1.80	1.89	3.36
S-14	1.84	1.47	0.49	1.91	1.26	3.07	S-29	2.47	1.53	0.79	1.54	2.73	3.24
S-15	1.62	1.02	0.87	4.49	0.66	5.75	S-30	2.01	1.55	0.58	1.85	3.56	3.21

样品编号	抽提前核磁信号强度/au				抽提后核磁信号强度/au
样品编号	类固体有机质	羟基化合物	水	轻质烃	类固体有机质	羟基化合物	水	轻质烃
S-4	0.393	2.132	0.252	0.259	0.138	1.798	0.123	0.178
S-5	0.758	5.109	0.119	0.111	0.427	4.736	0.172	0.068
S-10	0.274	2.677	0.279	0.129	0.209	2.169	0.181	0.071
S-11	0.675	1.606	0.269	0.329	0.406	1.246	0.192	0.112
S-20	0.300	1.090	0.476	0.071	0.087	1.215	0.343	0.075

Quantitative characterization and influencing factors of free oil content in lacustrine shale： A case study of Funing Formation in the Gaoyou Sag， Subei Basin

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Figures/Tables 18

References 43

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样品编号	抽提前含量/（μL/g）					抽提后含量/（μL/g）
样品编号	样品质量/g	类固体有机质	羟基化合物	水	轻质烃	样品质量/g	类固体有机质	羟基化合物	水	轻质烃
S-4	30.03	2.62	14.22	1.68	1.73	29.76	1.04	13.49	0.92	1.33
S-5	25.27	7.00	47.20	1.10	1.02	25.11	3.77	41.81	1.52	0.60
S-10	29.60	2.04	19.92	2.08	0.96	29.50	1.65	17.13	1.43	0.56
S-11	30.24	3.69	8.77	1.47	1.80	30.14	2.97	9.13	1.41	0.82
S-20	34.50	2.61	9.49	4.14	0.62	34.35	0.72	9.95	2.81	0.61

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