Hydrocarbon Accumulation Period and Its Carrier Systems in Ordovician Reservoir of Yubei Area, Markit Slope Tarim Basin
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摘要: 对玉北地区输导体系进行研究, 分析其油气运聚过程, 研究结果表明, 玉北地区油气基本输导介质主要分为: 断层、不整合、输导层, 其中玉北中部地区输导能力较强, 而玉北东部地区的输导能力较差.对玉北地区奥陶系3口井25块样品的有机和无机包裹体进行了分析, 分析结果表明, 玉北地区奥陶系油藏主要发生了两期成藏: 第1期发生在海西晚期262~252 Ma期间, 主要为发黄色荧光的低成熟油充注; 第2期发生喜山晚期12.5~0 Ma, 主要为发蓝白色荧光的高成熟度油充注.玉北地区奥陶系油藏有效烃源岩为下寒武统和上寒武统-下奥陶统两套烃源岩, 且发育储盖组合为: 下石炭统巴楚组泥岩、泥灰岩盖层与中-下奥陶统风化岩溶型储层组成的不连续层间组合.Abstract: Three types of basic carrier systems are identified for analyzing the hydrocarbon migration and accumulation process of Ordovician reservoir in Yubei area, Southwest Tarim Basin, which are known as fault type, unconformity type and carrier layer type, where the carrier ability is strong in the Middle Part of Yubei area but weak in the Eastern Part. The organic and inorganic fluid inclusion analyses of 25 Ordovician samples from 3 wells in Yubei area indicate that there were two phases of hydrocarbon charging in Ordovician. In the period from 262 Ma to 252 Ma before present (in Late Hercynian), low-mature oil with yellow fluorescence was charged. In the second period from 12.5 Ma to 0 Ma before present (in Late Himalayan), high-maturity oil with blue-white fluorescence was charged. Two groups of hydrocarbon source rocks, namely, the Lower Cambrian source rock and the Upper Cambrian-Lower Ordovician source rock, are developed in Yubei area. The cover is the mudstone and marl of Lower Carboniferous Bachu Formation Strata. The reservoir is the karst weathering of Lower-Middle Ordovician Strata. The cover and reservoir are composed of discontinuous interlayer combinations.
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Key words:
- inclusions /
- hydrocarbon charging events and ages /
- carrier systems /
- Ordovician /
- Yubei area /
- oil bearing formation
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图 3 玉北地区输导层类型
a.玉北1-1井，5 985.0~5 985.5 m(O1-2y)，微晶灰岩，溶蚀孔洞、裂缝发育；b.玉北1井，5 615.27~5 615.53 m(O1-2y)，泥晶灰岩，立缝、平行缝及微裂缝发育，褐色原油外渗；c.玉北3井，5 165 m(O1-2y)，1×10，灰岩，网状张开裂缝发育；d.玉北3井，5 258.75 m(O1-2y)，1×5，灰岩，构造-溶蚀裂缝
Fig. 3. The carrier layer types in Yubei area
图 4 玉北地区奥陶系代表性流体包裹体产状及荧光颜色
a1、a2.YB1，层位O1-2y，5 604.78 m，灰岩.溶孔充填方解石晶体中检测到大量发黄色和橙色荧光油包裹体；b1、b2.YB1-1，层位O1-2y，5 983.03 m，微晶灰岩.裂缝充填方解石晶体中检测到大量发橙色荧光油包裹体；c1、c2.YB3-a，层位O1-2y，5 494.45 m，泥晶灰岩.溶孔充填方解石晶体中检测到大量不发荧光的纯气相包裹体；d1、d2.YB3-b，层位O1-2y，5 444.8 m，泥晶灰岩.溶孔充填方解石晶体中大量发蓝白色荧光油包裹体；橙色、黄色和蓝白色分别指示第1、第2和第3幕次油充注.左为透射光，右为荧光
Fig. 4. Occurrences of the representative fluid inclusions and the fluorescence colors of oil inclusions in the Ordovician of Yubei area
图 5 玉北地区奥陶系不同幕次油包裹体荧光光谱
Fig. 5. The micro-beam fluorescence spectra of different times of oil inclusions from Ordovician in Yubei area
图 6 玉北地区奥陶系油包裹体QF535与λmax相关关系
Fig. 6. Relationship between QF535 and λmax of oil inclusions from Ordovician in Yubei area
图 7 玉北地区盐水包裹体均一温度-埋藏史投影法确定油气充注年龄
Fig. 7. Hydrocarbon charging ages determinated by aqueous inclusion homogenization temperature projecting on the burial historical charts in Yubei area
图 8 玉北地区奥陶系油气成藏期次划分和成藏时期确定
Fig. 8. The determination of hydrocarbon charging events and ages of Ordovician in Yubei area
表 1 玉北地区奥陶系流体包裹体平均均一温度(Th)统计
Table 1. The fluid inclusions homogenization temperature of Ordovician in Yubei area
井号 深度(m) 盐水包裹体(℃) 油包裹体(℃) Th1 Th2 Th3 Th4 Th5 Th1 Th2 Th3 Th4 YB1井 5 603.89 88.1 103.2 - - - 75.4 101.2 - - 5 604.78 89.3 103 - 152.4 - 75.3 103.2 134.3 - 5 604.83 - 104.4 120.1 - - 85.5 98.4 - - 5 605.07 88 112.5 136 - - 82.4 - - - 5 605.74 81.6 103.3 - - - - - - - 5 605.98 89 107.7 128.3 - - 75 - 130.3 189.7 5 606.34 - 104.1 - 148.1 164.8 - - - - 5 608.00 - 108.9 120 147.9 168.9 - - - - 5 617.03 80.3 - 121 145.3 - 78.1 - - - 5 617.43 97.7 - - 145.7 - 89.6 - - - 5 716.8 92 102.5 130.2 - - - - - - 5 722.97 80.7 102.2 123.4 141.3 - - - - - YB1-1井 5 983.03 - 105.4 123 - - 76 110.4 137.2 - YB3井 5 160 84.9 105.9 128.6 - - - - - - 5 164 83.2 - 124.9 - - - - - - 5 165 84.7 109.3 - 148 - - - - - 5 166 84.6 - 124.9 - - - - - - 5 258.75 84.8 105.6 127 - - - - - - 5 365 - - 122.3 137.5 160 80.7 104.5 - 176.9 5 365.5 82.2 107 121.9 153.4 - - 108 129.8 - 5 444.8 - 108 125.6 155.5 - 75.4 94.1 121.9 - 5 446.52 - - 126.8 144.8 - 65 98.7 134.3 - 5 451.9 - 107.2 122.6 - - 82 106.9 - - 5 494.1 91.4 101.6 124.3 145.9 175.5 69.2 102.2 - 173.4 5 494.45 85.3 106.4 - - - 80.3 - - - 
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