Evidences and controlling factors of hydrocarbon charging in the Late Silurian in the north slope of the Tazhong Uplift,Tarim Basin

Wu You; Chen Honghan; Zhao Yutao; Tang Daqing; Yun Lu; Qi Lixin

doi:10.11743/ogg20170209

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Evidences and controlling factors of hydrocarbon charging in the Late Silurian in the north slope of the Tazhong Uplift,Tarim Basin
Vol. 38, Issue 2, Pages: 292-301(2017)
Online First：28 April 2017，

Published：2017
DOI： 10.11743/ogg20170209
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DOI：

Wu You, Chen Honghan, Zhao Yutao, et al. Evidences and controlling factors of hydrocarbon charging in the Late Silurian in the north slope of the Tazhong Uplift,Tarim Basin[J]. 2017, 38(2): 292-301. DOI： 10.11743/ogg20170209.

摘要

塔中北斜坡志留系近几年在油气勘探上取得重大突破，但由于受多期构造运动影响，油气成藏过程复杂。通过对塔中北斜坡志留系23块样品的流体包裹体系统分析以及断裂活动特征研究，识别出研究区存在3期油充注和1期天然气充注，以海西晚期（318~245 Ma）寒武系-下奥陶统油充注和燕山期-喜马拉雅中晚期（124~25 Ma）寒武系-下奥陶统以及中-上奥陶统油气充注为主。研究区志留系在北东向张扭性走滑断裂的控制下，海西晚期虽然油充注活跃但油藏基本遭受破坏形成残留沥青，而燕山期-喜马拉雅中晚期的油气再充注决定了现今油气藏面貌。因此，塔中北斜坡应以寻找燕山期-喜马拉雅中晚期油气藏为主要勘探目标。

Abstract

In recent years

a breakthrough has been achieved in the exploration of the Silurian strata in the north slope of the Tazhong Uplift.However

it also reveals the complexity of the hydrocarbon accumulation process

owing to the multistage tectonic movement.In this paper

fluid inclusions analysis is performed on 23 samples of the Silurian strata in the north slope of the Tazhong Uplift

and also faulting activities characteristics were studied.The results indicate that there are four events of oil charging and one event of gas charging.The oil originated from the Cambrian to the Lower Ordovician source rock charged during the Late Hercynian (318-245 Ma)

while oil and gas originated from the Cambrian-Lower Ordovician source rock and Middle-Upper Ordovician source rock charged during the Yanshanian to Middle-Late Himalayan (124-25 Ma).Due to the NE extensional strike-slip faulting

the early stage charged accumulations were destroyed and only residual bitumen remains

even though oil charging was active during the Late Hercynian.The oil and gas recharged during the Middle-Late Himalayan determined the hydrocarbon characteristics in the reservoirs.In all

the major targets for hydrocarbon exploration in the north slope of the Tazhong Uplift shall be accumulations formed during the Yanshanian to Middle-Late Hercynian.