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Gradual Evolution from Fluvial Dominated to Tide Dominated Deltas and Channel Type Transformation: A Case Study of MPE3 Block in the Orinoco Heavy Oil Belt of the Eastern Venezuelan Basin
投稿时间:2018-08-01  修订日期:2018-12-20  点此下载全文
引用本文:HUANG Wensong,CHEN Heping,XU Fang,MENG Zheng,ZHANG Fanqin,WU Suwei.2019.Gradual Evolution from Fluvial Dominated to Tide Dominated Deltas and Channel Type Transformation: A Case Study of MPE3 Block in the Orinoco Heavy Oil Belt of the Eastern Venezuelan Basin[J].ACTA GEOLOGICA SINICA(English edition),93(6):1909~1921
摘要点击次数: 55
全文下载次数: 63
DOI:10.1111/1755-6724.13859
作者单位E-mail
HUANG Wensong 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China hwshws6@petrochina.com.cn 
CHEN Heping 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
XU Fang 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
MENG Zheng 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
ZHANG Fanqin 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
WU Suwei 2 University of Calgary, Canada  
 
Author NameAffiliationE-mail
HUANG Wensong 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China hwshws6@petrochina.com.cn 
CHEN Heping 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
XU Fang 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
MENG Zheng 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
ZHANG Fanqin 1 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China  
WU Suwei 2 University of Calgary, Canada  
Abstract:Based on the data of core description and sporopollen analysis, the gradual evolution of deltas in vertical direction and transition of channel types in the MPE3 block of the eastern Venezuela Basin have been surveyed by seismic phase and well logging facies interpretation. The results show that due to the great sea level rise, the sedimentary system of the Miocene Oficina Formation in the MPE3 block shifted from the distal-source sandy braided river delta to tide-affected delta, and eventually to tide-dominated delta. Vertically, during the early stage of sedimentation of Oficina Formation, the distributary channels of the delta were dominated by braided river channels. While in the later stage, as the tidal effect was gradually intensified, the channel changed from braided channel to meandering channel. On plane, as a result of differential transgression, sedimentary framework and distribution of sand bodies vary across the study area. Compared with the eastern part, the western part has more braided channels, larger channel bars, less developments of distributary bay and higher ratio of sand to mud. Whereas the braided channels in the south are larger than those in the north. It is the first time we pointed out the impact of marine transgression differences on the sedimentary facies distribution and river type transition in the study area. Factors like the structural and paleogeomorphological change, sea level variation, supply of sediments have strong influence on the evolution of sedimentary system and distribution of sandbodies. It is predicted that the major sandbody is more developed in the central south, which can guide the subsequent horizontal well development.
keywords:Orinoco heavy oil belt, Miocene Oficina Formation, braided river-dominated delta, tide-dominated delta, river type transition
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