Influence ofNeotectonics on hydrocarbon generation in the Paleogene source rocks of the northern Dongpu Depression and its implications for the form ing of oil/gas pools in shallow strata

doi:10.11743/ogg20100318

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Influence ofNeotectonics on hydrocarbon generation in the Paleogene source rocks of the northern Dongpu Depression and its implications for the form ing of oil/gas pools in shallow strata
Vol. 31, Issue 3, Pages: 386-392(2010)
Online First：24 August 2010，

Published：2010
DOI： 10.11743/ogg20100318
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DOI：

Influence ofNeotectonics on hydrocarbon generation in the Paleogene source rocks of the northern Dongpu Depression and its implications for the form ing of oil/gas pools in shallow strata[J]. 2010, 31(3): 386-392. DOI： 10.11743/ogg20100318.

摘要

古近纪以来，东濮凹陷在东营组沉积末期和明化镇组沉积晚期经历了两期构造运动，构造运动对深层烃源岩的生烃作用和浅层油气成藏均具有重要的影响。在埋藏史的恢复和前人热演化史研究的基础上，恢复了古近纪以来沙河街组三段烃源岩的生烃史，探讨了构造运动对沙河街组三段烃源岩生烃的影响，并分析了这种影响对浅层油气成藏的意义。研究认为，东营运动强度较大，抑制或延缓了深层烃源岩的生烃进程，造成了烃源岩晚期大规模生烃;同时，东营运动保存了深部烃源岩的生烃潜力，为后期再度埋深的二次生烃及明化镇组沉积末期浅层油气藏的形成奠定了物质基础。

Abstract

Since the Paleogene，the Dongpu depression has experienced two stages of tectonic movements，at the end of sedimentation of the Dongying Formation and in the late period of sedimentation of the Minghuazhen Formation respectively.These tectonic movements putgreat influence on hydrocarbon generation of the deepˉburied source rocks and the forming ofoil/gas pools in shallow strata.On the basis ofburialhistory reconstruction and previous studies on thermal evolution，we reconstruct the hydrocarbon generation history of source rocks in the thirdmember of the Shaheˉjie Formation since Paleogene，discuss the influence of tectonicmovements on hydrocarbon generation of source rocks in the thirdmember of the Shahejie Formation and analyze its implications for the forming of oil/gas pools in shallow strata.According to the results，it is believed that（i）the great strength of the DongyingMovement restrained and delayed hydrocarbon generation of the deepˉburied source rocks，which led to the massive hydrocarbon generation after the DongyingMovement;（ii）the DongyingMovement preserved the hydrocarbon generation potential of the deepˉburied source rocks，which laid foundations for secondary hydrocarbon generation when the source rocks were buried deeper and the forming of oil/gas pools in the late period of sedimentation of theMinghuazhen Formation.