Reservoir-Forming Periods and Accumulation Process of Chaluhe Fault Depression of Yitong Basin
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摘要: 揭示伊通盆地岔路河断陷复杂的油气成藏历史, 对指导伊通盆地油气勘探具有十分重要的意义.一维数值模拟结果显示: 岔路河断陷主要烃源岩在始新世中、晚期进入生烃门限; 渐新世早、中期达到生烃高峰.通过对岔路河断陷双阳组-永吉组砂岩储层流体包裹体样品中有机包裹体的荧光特征、均一温度以及共生盐水包裹体均一温度等分析, 结果表明, 岔路河断陷至少经历过3期油气充注; 结合埋藏史热史分析, 确定出油气充注分别发生在距今38.1~27 Ma、19.5~10 Ma和1~0 Ma, 与生排烃史模拟结果有很好的一致性.结合盆地构造演化认为古近纪末期和新近纪晚期两期构造抬升两度中止了油气充注过程, 最终形成了该断陷始新世晚期-渐新世中期、中新世早-中期和第四纪3个重要的油气成藏时期.Abstract: It is very significant to probe the complex charging history in Chaluhe depression of Yitong basin.1D numeric modelling of hydrocarbon generation and expulsion history of source rocks in 4 wells confirms that the major source rocks had entered their threshold of maturity at the Middle-Late Eocene and reached the peak generation stage at the Early-Middle Oligocene.For this study, 145 fluid inclusion samples from 19 wells have been employed to systematically obtain information on fluorescent colors of hydrocarbon inclusions, homogenization temperatures of oil inclusions and their coeval aqueous inclusions.The results indicate three events of oil charging for the Paleocene reservoirs.By integrating with the burial historical curves, the oil charging events have been reconstructed at 38.1-27 Ma, 19.5-10 Ma and 1-0 Ma respectively.When combining the known information on hydrocarbon charging history and structural evolution, two intermittent periods of hydrocarbon migration and accumulation have been revealed, which were at 27-19.6 Ma and 10-2 Ma, respectively, corresponding to two structural uplift stages.In other words, tectonic uplift events occurring at the Late Palaeogene and the Early Neogene stopped the hydrocarbon supplies or destroyed the migrated and accumulated hydrocarbon so that hydrocarbon inclusions can not be probed at the two stages.Therefore, the Late Eocene to Middle Oligocene, Early-Middle Miocene and the Quaternary are the three important reservoir-forming periods in Chaluhe fault depression.
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图 1 伊通盆地构造位置和构造单元图
Fig. 1. Tectonic position and division of tectonic units of Yitong basin
图 2 岔路河断陷4口井主要烃源岩生排烃史
1.生油; 2.生气; 3.残留烃; 4.排油; 5.排气; 6.烃源岩层生油底界; 7.烃源岩层生气底界
Fig. 2. Hydrocarbon generation and expulsion histories of major source rocks for 4 wells in Chaluhe fault depression
图 3 岔路河断陷不同期次油包裹体产状及荧光颜色观察结果
A1、A2、A3及A4为透射光照片; B1、B2、B3及B4为相应的荧光照片
Fig. 3. Micrographs showing the occurrences and fluorescent colors of different orders of oil inclusion in Chaluhe fault depression
图 4 伊通盆地岔路河断陷有机包裹体特征
“-”表示未检测到有机包裹体或者未检测到同期盐水包裹体; “Th”表示包裹体均一温度
Fig. 4. Characteristics of hydrocarbon inclusions in Chaluhe fault depression of Yitong basin
图 5 伊通盆地岔路河断陷流体包裹体确定油气充注期次和充注时期
Fig. 5. Dating results of oil charging by fluid inclusion method in Chaluhe fault depression
图 6 伊通盆地岔路河断陷油气成藏事件
Fig. 6. Hydrocarbon accumulation events in Chaluhe fault depression of Yitong basin
图 7 岔路河断陷过万昌构造带昌4井一昌27井油藏演化剖面
Fig. 7. Cross section of hydrocarbon accumulation evolution of the Wanchang tectonic zone
表 1 岔路河断陷主要烃源岩生烃时期
Table 1. Hydrocarbon generation periods of major source rocks in Chaluhe fault depression
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