新疆石油地质 ›› 2024, Vol. 45 ›› Issue (1): 35-46.doi: 10.7657/XJPG20240105
收稿日期:
2023-08-17
修回日期:
2023-10-12
出版日期:
2024-02-01
发布日期:
2024-01-23
作者简介:
孔令印(1993-),男,河南新乡人,工程师,硕士,油气地质与地球化学,(Tel)13156854308(Email)基金资助:
KONG Lingyin(), LI Jianfeng, WU Kai, MA Jun
Received:
2023-08-17
Revised:
2023-10-12
Online:
2024-02-01
Published:
2024-01-23
摘要:
为明确鄂尔多斯盆地东南部黄陵—铜川地区延安组煤矿原油的地球化学特征及其成因,利用气相色谱、色谱质谱和同位素质谱技术,对研究区原油、煤岩和泥岩抽提物进行了生物标志化合物组成以及正构烷烃单体碳同位素分布特征的对比研究。煤矿原油姥鲛烷和植烷均势,倍半萜含量丰富,Ts/Tm、C29Ts/C29降藿烷相对较高,C30莫烷/C30藿烷、C29降藿烷/C30藿烷、C31升藿烷及C32升藿烷的22S/(22S+22R)相对较低,ααα-20R规则甾烷呈“V”字形分布,碳同位素及正构烷烃单体碳同位素偏轻;侏罗系煤系烃源岩抽提物中Pr/Ph高,倍半萜含量较低、Ts/Tm、C29Ts/C29降藿烷低,C30莫烷/C30藿烷、C29降藿烷/C30藿烷、C31升藿烷及C32升藿烷的22S/(22S+22R)高,ααα-20R规则甾烷呈倒“L”字形分布,碳同位素及正构烷烃单体碳同位素偏重。原油特征与煤系潜在烃源岩存在明显的差异,与盆地内长7段深湖亚相烃源岩及其生成烃一致。侏罗系延安组煤处于低成熟阶段,所生成的液态烃不能完全满足自身吸附的需要,不具备排出液态烃的能力,铜川崔家沟煤矿和黄陵店头煤矿原油均来源于下伏的长7段烃源岩。
中图分类号:
孔令印, 李剑锋, 吴凯, 马军. 鄂尔多斯盆地黄陵—铜川地区延安组煤矿原油成因[J]. 新疆石油地质, 2024, 45(1): 35-46.
KONG Lingyin, LI Jianfeng, WU Kai, MA Jun. Origin of Crude Oil From Coal Mine of Yan’an Formation in Huangling-Tongchuan Area,Ordos Basin[J]. Xinjiang Petroleum Geology, 2024, 45(1): 35-46.
表1
煤矿原油及中生界烃源岩萜类化合物组成特征"
煤矿和井名 | 层位 | 样品类型 | 补身烷/ 升补身烷 | (补身烷+ 升补身烷)/C30H | Ts/Tm | C29M/ C29H | C30M/ C30H | C29H(Ts)/ C29H | C29H/ C30H | γ蜡烷/ C30H | C31S/ (R+S) | C32S/ (R+S) |
---|---|---|---|---|---|---|---|---|---|---|---|---|
崔家沟煤矿 | 延安组 | 原油 | 0.82 | 0.69 | 0.70 | 0.10 | 0.10 | 0.24 | 0.53 | 0.04 | 0.54 | 0.52 |
焦坪煤矿 | 延安组 | 原油 | 1.21 | 0.63 | 0.83 | 0.11 | 0.11 | 0.25 | 0.53 | 0.04 | 0.55 | 0.53 |
店头煤矿 | 延安组 | 原油 | 0.65 | 1.59 | 0.83 | 0.02 | 0.23 | 0.52 | 0.08 | 0.53 | 0.55 | |
H63井 | 延安组 | 原油 | 1.24 | 0.79 | 0.94 | 0.09 | 0.09 | 0.33 | 0.46 | 0.07 | 0.53 | 0.44 |
He63井 | 延安组 | 原油 | 1.07 | 0.92 | 1.16 | 0.10 | 0.10 | 0.30 | 0.45 | 0.06 | 0.51 | 0.52 |
N228井 | 长7段 | 原油 | 0.64 | 0.36 | 0.55 | 0.09 | 0.08 | 0.16 | 0.50 | 0.07 | 0.52 | 0.57 |
N228井 | 长7段 | 油砂 | 0.61 | 0.33 | 0.62 | 0.08 | 0.18 | 0.52 | 0.09 | 0.54 | 0.57 | |
LY6井 | 长7段 | 原油 | 1.23 | 4.45 | 3.46 | 0.14 | 0.84 | 0.41 | 0.23 | 0.52 | 0.54 | |
LY7井 | 长7段 | 原油 | 1.19 | 9.20 | 4.48 | 0.15 | 0.94 | 0.48 | 0.31 | 0.35 | 0.52 | |
Xi270井 | 长7段 | 原油 | 0.82 | 1.01 | 1.56 | 0.20 | 0.09 | 0.40 | 0.46 | 0.13 | 0.54 | 0.51 |
崔家沟煤矿 | 延安组 | 煤 | 0.28 | 0.03 | 0.02 | 0.59 | 0.47 | 0.01 | 0.66 | 0.02 | 0.56 | 0.70 |
店头煤矿 | 延安组 | 煤 | 0.18 | 0.17 | 0.02 | 0.36 | 0.57 | 0.01 | 0.82 | 0.05 | 0.59 | 0.70 |
Qing69-9井 | 延安组 | 煤 | 0.32 | 0.03 | 0.06 | 0.26 | 0.32 | 0.01 | 0.83 | 0.01 | 0.59 | 0.65 |
ZH5井 | 延安组 | 暗色泥岩 | 0.38 | 0.15 | 0.03 | 0.28 | 0.38 | 0.01 | 0.79 | 0.03 | 0.59 | 0.66 |
Liu109井 | 延安组 | 暗色泥岩 | 0.16 | 0.07 | 0.07 | 0.52 | 0.44 | 0.08 | 0.83 | 0.05 | 0.57 | 0.74 |
Qing69-7井 | 延安组 | 暗色泥岩 | 0.42 | 0.02 | 0.14 | 0.29 | 0.25 | 0.10 | 0.76 | 0.01 | 0.58 | 0.64 |
N10井 | 长6段 | 黑色泥岩 | 1.00 | 1.11 | 0.99 | 0.07 | 0.11 | 0.56 | 0.41 | 0.03 | 0.50 | 0.60 |
ZH42井 | 长6段 | 黑色泥岩 | 0.73 | 1.78 | 0.70 | 0.11 | 0.26 | 0.27 | 0.37 | 0.14 | 0.50 | 0.60 |
ZH5井 | 长7段 | 黑色泥岩 | 0.56 | 1.20 | 0.79 | 0 | 0.25 | 0.16 | 0.56 | 0.12 | 0.42 | 0.59 |
ZH9井 | 长7段 | 泥页岩 | 0.78 | 0.89 | 0.78 | 0.04 | 0.12 | 0.13 | 0.50 | 0.13 | 0.56 | 0.48 |
ZH126井 | 长7段 | 泥页岩 | 0.59 | 0.40 | 0.28 | 0.11 | 0.05 | 0.37 | 0.38 | 0.02 | 0.50 | 0.60 |
ZH156井 | 长7段 | 泥页岩 | 1.11 | 0.49 | 0.57 | 0.10 | 0.15 | 0.09 | 0.53 | 0.38 | ||
N12井 | 长8段 | 黑色泥岩 | 0.32 | 0.62 | 0.59 | 0.20 | 0.18 | 1.11 | 0.38 | 0.09 | 0.50 | 0.60 |
N36井 | 长8段 | 黑色泥岩 | 0.46 | 0.83 | 0.54 | 0.12 | 1.37 | 0.36 | 0.50 | 0.60 |
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