Oil source correlation and its relationship with deeply buried hydrocarbon accumulations in Tianjingshan Paleo-uplift area, northern segment of Western Sichuan Depression
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摘要: 四川盆地西部坳陷北段天井山古隆起区具有丰富油气显示,古油藏油源示踪与成藏破坏过程厘定对川西坳陷北段深层油气成藏过程与机理研究具有重要意义。天井山古隆起构造解析明确寒武纪-奥陶纪之交的构造事件在川西坳陷北段有显著表现。天井山古隆起的形成是早古生代绵阳-长宁拉张槽形成后构造-沉积性质由拉张转向挤压的重要节点。川西坳陷北段油气地质条件分析表明,下寒武统麦地坪组-筇竹寺组是海相油气的最佳烃源岩。将灯影组储层沥青纳入川西坳陷北段古油藏研究范畴,完成完整的天井山古隆起区烃源岩-古油藏油源示踪。有机碳同位素与生物标志化合物指标指示,古油藏的主要母源是下寒武统富有机质黑色泥页岩,最终建立“天井山古隆起古油藏系统”概念。根据相应的生储盖组合划分、油源判别与构造期次梳理,再次证实川西坳陷北段复杂构造背景下深层海相油气多期多样成藏过程可分为“原生油藏-原生气藏”与“次生油藏-原生气藏”两类。Abstract: The Tianjingshan Paleo-uplift (TJS PU) area in the northern segment of Western Sichuan Depression (NSWSCD) has abundant oil and gas shows. The traceability of paleo-oil reservoirs and their destruction are of great significance to the study of the characteristics and mechanism of deep hydrocarbon accumulations. This study focuses on the tectonic evolution of Mianyang-Changning Intracratonic Sag (MY-CN IS) and TJS PU. The Cambrian-Ordovician tectonic movement was significant in the NSWSCD, as indicated by the formation of the TJS PU. From tension to compression tectonic-sedimentary evolution, the TJS PU is an important node in the Early Paleozoic. The analysis of deep marine hydrocarbon geological characteristics in the NSWSCD shows that the Lower Cambrian Maidiping-Qiongzhusi formations are the best source rock. Reservoir bitumen in the Dengying Fm is used as a template to identify organic geochemical parameters of paleo-oil reservoir systems with different layers and different phases in the TJS PU area. Organic carbon isotope and biomarker compounds indicate that the main source of paleo oil reservoirs is the Lower Cambrian organic-rich black shale, and the concept of "Tianjingshan Paleo-uplift paleo-reservoir system" is finally established. According to the corresponding classification of source-reservoir-caprock combination, oil source identification and tectonic evolution period study, it is once again confirmed that the deep marine oil and gas multi-phase and diverse accumulation process under the complex structural background of the northern segment of the Western Sichuan Depression can be divided into "primary oil reservoir-primary gas reservoir" and "secondary oil reservoir-primary gas reservoir" types.
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图 4 川西坳陷北段深埋藏—强隆升分带特征剖面
剖面位置见图 1重点剖面。
Figure 4. Section of deeply buried and strong uplift subzone, northern segment of Western Sichuan Depression
图 5 龙门山—米仓山前缘潜在烃源岩典型野外岩相照片
a.陡山沱组与灯影组假整合接触,陡山沱组顶部黑色碳质泥岩,夹磷质结核与条带,汉旺清平;b.QP-6,下寒武统麦地坪组,辉绿岩脉侵入,汉旺清平;c.茅口组瘤状灰岩层间夹薄层黑色页岩,油侵明显,上寺长江沟;d.中下志留统灰绿色页岩与下泥盆统平驿铺组呈假整合接触,江油雁门坝;e.P-T界限,HY-GYCJG/ CJG-11,上二叠统大隆组与下三叠统飞仙关组呈假整合接触,上寺长江沟;f.疑似陡山沱组与灯影组呈假整合接触,界限处灯影组见沥青充填,青川关庄;g.震旦系—寒武系界限,灯影组与筇竹寺组呈假整合接触,光雾山大坝乡;h.灯三段碎屑岩与灯二段白云岩整合接触,宁强胡家坝;i.陡山沱组大套黑色碳质泥页岩,宁强大安镇南坪乡
Figure 5. Typical field lithofacies photos of potential source rocks in the front of Longmenshan-Micangshan area
图 6 川西坳陷北段天井山古隆起区古油藏分布
a.宁强胡家坝,Z2dn4,白云岩孔洞及不整合面沥青;b.CJG-10,上寺长江沟,T1f,灰色薄板状泥晶灰岩,原油渗出;c.GY-7,上寺长江沟(天井山古隆起北段),P2m,灰黑色中—厚层状瘤状灰岩,原油沿孔洞及缝合线渗出;d.TB-8,碾子坝(天井山古隆起北段), ,浅灰色中—厚层状钙质粉砂岩,巨型沥青脉近垂直地层侵入;e.CJG-12,建峰乡,D-P,厚层块状泥晶白云岩,岩缝间见大量原油干涸;f.NZB-04,建峰乡,褐黑色厚层—块状岩屑石英粗砂岩,原油从层间渗出;g.TJS-01,天井山拌桶岩(天井山古隆起中段),D1p,灰白色中—厚层状岩屑石英粗砂岩,稠油沿层间渗出;h.QLK-01,厚坝黄金口(天井山古隆起南段),J2s,黑褐色厚层—块状岩屑石英粗砂岩,油侵特征明显;i.HB-01,青林口(天井山古隆起南段)J2s,辛家沟1井稠油
Figure 6. Paleo-oil reservoir distribution in Tianjingshan Paleo-uplift area, northern segment of Western Sichuan Depression
图 7 川西坳陷北段烃源岩饱和烃气相色谱—质谱比对
Soxh为索式抽提,HyPy为催化加氢;NJ-S-2据文献[8]。
Figure 7. GC-MS characteristic of source rocks in Tianjingshan Paleo-uplift area, northern segment of Western Sichuan Depression
图 8 川西坳陷北段天井山古隆起区古油藏抽提物气相色谱—质谱图
Soxh为索式抽提,HyPy为催化加氢;GY-B-38据文献[8]。
Figure 8. GC-MS characteristics of paleo-oil reservoirs in Tianjingshan Paleo-uplift area, northern segment of Western Sichuan Depression
表 1 川西坳陷北段天井山古隆起区烃源岩、古油藏样品基本情况
Table 1. Characteristics of source rocks and paleo-reservoir samples in Tianjingshan Paleo-uplift area, northern segment of Western Sichuan Depression
样品类别 样品号 层位 岩性、样品特征 取样点 成熟度/% w(TOC)/% 实验方法(Soxh/HyPy) Ro Rb 烃源岩 ZYSL-120 陡山沱组 碳硅泥岩 遵义松林 3.50 1.20 √/√ QP-6 麦地坪租 碳硅质泥页岩 汉旺清平 1.56 1.86 √/× CS1-8140 筇竹寺组 碳硅质泥页岩 川深1井 1.52 2.56 √/× NJ-S-2 郭家坝组 硅质页岩 南江杨坝 3.05 4.05 √/√ GYCJG 大隆组 硅质泥页岩 上寺长江沟 0.58 8.75 √/√ CJG-11 飞仙关组 灰黑色泥岩 上寺长江沟 0.49 1.93 √/× 古油藏 YB-1 灯影组 储层沥青 南江杨坝 3.26 √/× NZB-4 长江沟组 稠油油苗 建峰乡 0.26 √/× TB-8 长江沟组 固体沥青脉 碾子坝 0.51 √/√ TJS-1 平驿铺组 稠油油苗 天井山 0.65 √/√ CJG-12 栖霞组 稠油油苗 建峰乡 √/× GY-7 茅口组 稠油油苗 上寺长江沟 √/× CJG-10 飞仙关组 稠油油苗 上寺长江沟 0.94 √/× QLK-1 沙溪庙组 油砂岩 青林口 0.41 √/√ HB-1 沙溪庙组 稠油 辛家沟1井 1.03 √/√ 表 2 川西坳陷北段古油藏系统生标物参数特征
Table 2. Biomarker parameters of Tianjingshan Paleo-oil reservoirs, northern segment of Western Sichuan Depression
成藏要素 层位/样品号 生物标志化合物参数 TT23/tT24 TT23/H30 H29/H30 Ts/(Ts+Tm) C29-20S /(20S+20R) C29-ββ/(αα+ββ) S21/S22 (S21+S22)/(C27+C28+C29) 规则甾烷/% C27 C28 C29 烃源岩 T1f1/CJG-11 1.25 1.49 0.29 0.48 0.51 2.46 0.36 23 25 52 P3d/GYCJG 1.10 0.28 0.91 0.17 0.44 0.52 1.19 0.33 39 31 30 /CS1-81400.70 0.78 0.50 0.40 0.37 3.75 0.43 37 31 32 /QP-62.74 0.67 0.74 0.50 0.42 0.36 2.28 0.12 38 32 30 古油藏 J2s/QLK-1 3.32 1.80 1.17 0.48 0.46 0.60 2.63 0.44 27 22 51 T1f3/CJG-10 1.90 0.39 0.75 0.31 0.37 0.30 2.37 0.10 28 32 40 P2m/GY-7 3.74 0.17 0.71 0.41 0.47 0.57 2.49 0.19 23 21 56 P2q/CJG-12 2.48 0.14 0.88 0.33 0.46 0.56 2.34 0.13 29 23 48 D1p/TJS-1 2.17 1.80 1.45 0.27 0.46 0.56 2.08 0.42 23 23 54 /NZB-42.78 2.40 1.42 0.23 0.46 0.58 1.99 0.35 24 27 49 /TB-82.68 1.96 1.78 0.27 0.44 0.58 2.62 0.96 29 30 44 Z2dn4/YB-1 3.37 0.29 0.79 0.12 0.46 0.27~0.44 2.77 0.19 27 31 42 -
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