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| Hydrocarbon transportation system and reservoir forming model of Es3 in slope belt of Chezhen depression |
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LIU Hua1,2, ZHAO Shan1,2, LIANG Shuyi3, GUO Qintao3, ZHU Yongying3, HAN Xiao1,2
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(1.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3.Dongsheng Petroleum Development Group Company Limited of Shengli Oilfield, Dongying 257000, China)
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| Abstract: |
| Based on the analysis of geological, seismic and logging data, the characteristics of the transport system and the mode of hydrocarbon migration and accumulation in the slope belt of Chezhen depression are analyzed, and the main controlling factors of hydrocarbon enrichment in the slope zone are determined. The study shows that the hydrocarbon in the slope belt of Chezhen depression is mainly concentrated in the upper Es3, which has direct contact with the source rocks of the middle and lower Es3, and fault communication and other contact relationships. The fault of effective hydrocarbon source rocks is weak in the accumulation stage, and the activities of faults 1 and 2 are longer, which controls the accumulation of oil and gas in the slope belt from the inner slope to the outer slope. The hydrocarbon converges along the regulating faults and their combined sand bodies to the structural ridge and the skeleton sand body development area, forming a dominant channel at No.7 fault in the west of the study area. There are great differences in hydrocarbon accumulation conditions in different structural zones. The main reason for drilling failure is the poor physical properties of sand bodies in the inner slope zone; the hydrocarbon distribution in the middle and outer zones is mainly controlled by the change of dominant migration path under the control of fault sand combination. With the increase of migration distance, the effective sand body buried depth gradually increases, showing a "ladder" migration mode. On the whole, the source reservoir contact relationship controls the supply of hydrocarbon, the dominant migration channel controls the direction of oil and gas migration, and the fault sand combination relationship controls the change of hydrocarbon accumulation horizon. |
| Key words: transport system hydrocarbon migration losing well analysis hydrocarbon accumulation mode slope belt Chezhen depression |
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