Paleohydrocarbon Water Contact Restoration of Typical Silurian Oil and Gas Reservoirs in the Northern Tarim Basin
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摘要: 油气藏油水界面的变迁记录了油气藏形成以后调整、改造甚至破坏的历史.恢复各地质时期的古油气水界面的位置, 可以帮助我们确定地下烃类流体运聚成藏的时间, 恢复流体成藏后的变迁、调整过程, 认识油气藏形成、分布的规律, 对研究区作出较为准确的资源评价.应用含油包裹体颗粒指数(GOI) 方法和定量颗粒荧光(QGF) 技术对塔北地区典型油气藏的古油水界面进行了恢复, 结果表明, 塔北地区志留系古油藏古油水界面的位置低于现今沥青砂岩段底界的位置, 沥青砂岩段底界并不是古油层的底界, 在沥青砂岩段之下还有一段古油柱, 在油藏破坏过程中, 这部分原油运移到构造的高部位了, 没有在原地留下沥青; 沥青砂的厚度小于古油柱的厚度, 这意味着古油藏的规模要大于现今油藏规模.
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关键词:
- 塔北地区 /
- 志留系 /
- 古油水界面恢复 /
- 含油包裹体颗粒指数(GOI) /
- 定量颗粒荧光(QGF)
Abstract: Changes in hydrocarbon-water contact record the history of the adjustment, reconstruction and even destruction of reservoirs. Restoring the positions of paleohydrocarbon-water contact of reservoirs in different periods of geological history can determine the timing of migration, accumulation of hydrocarbon and reservoir adjustment. This can aid in understanding the laws governing the formation and distribution of reservoirs and assist in the evaluation of petroleum resources. The paleohydrocarbon-water contact of the typical reservoirs in northern Tarim was restored using the methods of GOI and QGF. The results show that the paleohydrocarbon-water contact of Silurian reservoirs in the northern Tarim is lower than the bottom of the current asphalt sandstone. That is, there is a paleo-oil column below the current asphalt sandstone and the oil in it has migrated into the structural high and has not left the asphalt during the period of the reservoir's destruction. So, the thickness of asphalt sandstone is less than the height of the paleo-oil column, which means the szle of paloreserviores is bigger than that of current reserviors.-
Key words:
- northern Tarim basin /
- Silurian /
- paleohydrocarbon water contact restoration /
- GOI /
- QGF
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图 1 油层与水层GOI数据对比(据Eadington et al., 1996修改, 数据来自澳大利亚23个油田)
Fig. 1. GOI data contrast between oil layer and water layer
图 2 利用GOI数据恢复古油藏油水界面示意图(据朱扬明, 1999修改)
a. 构造运动造成古油水界面发生变化; b. 天然气排驱原油造成古油水界面发生变化
Fig. 2. Oil-water contact sketch map of ancient oil reservoir recovered by GOI data
图 3 澳大利亚Timor Sea地区古油层与水层样品荧光强度变化(Liu and Eadington, 2003, 未出版)
Fig. 3. Map showing fluorescence intensity variation of ancient oil layer sample and water layer sample in Timor Sea area of Australia
图 4 GOI数据与QGF指数的相关性(数据来自塔里木盆地志留系储层样品实测数据)
Fig. 4. Correlation of GOI data and QGF index
图 5 塔北地区油藏剖面演化
a. 塔北东西向剖面; b. 塔北南北向剖面
Fig. 5. Oil reservoir section evolution diagram of the northern Tarim basin
图 7 GOI与QGF指数确定HD1-18H井古油水界面
Fig. 7. Ancient oil-water contact of HD1-18H confirmed by GOI and QGF index
图 8 哈1井(a) 与跃南1井(b) QGF指数变化
Fig. 8. QGF index variation of HA1 well (a) and YN1 well (b)
表 1 哈得1-18H井GOI数据测定结果
Table 1. GOI data testing results of HD 1-18H well
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