早始新世极热气候时期湖盆水体性质及生烃环境——以东营凹陷古近系孔店组为例

doi:10.11743/ogg20170105

Abstract

Abstract:

The Initial Eocene Thermal Maximum(IETM) has seriously affected the water quality and biological activities of sea and lake.Based on the experimental results of drilling cores,elemental analysis,organic carbon isotope and TOC,the lakewater oxidation-reduction conditions and paleoproductivity of Dongying terrestrial fault basin during early Eocene has been studied in this paper.It turned out that the lacustrine was strongly reductive but resumed oxidation environment afterward.The fluctuations of redox interface caused by the extreme climate events changed the lacustrine redox pattern,which resulted in the "disharmony" of the oxidation-reduction variation along the water depth.The productivity of the lacustrine was high in the early time,followed by a rapid decrease but increased progressively again.The lowest productivity period is basically consistent with the IETM.It has confirmed that the Initial Eocene Thermal Maximum (IETM) has affected the spatial and temporal fluctuation of the lacustrine.This event has obvious sedimentary record and biogeochemical response,which determines water oxidation-reduction and the bio-mass activities of the original basin.The hypoxia of lacustrine caused by thermal maximum resulted in the temporary decrease in productivity.However,productivity has been greatly restored with the sufficient oxygen supply after the event.This is especially demonstrated in the No.four section of Shahejie Formation with the higher TOC content and the productivity,and thus becomes the main reservoir of tight oil and gas production.

Key words: redox, paleoproductivity, IETM, Early Eocene, Kongdian Formation, Dongying Sag

CLC Number:

TE121.3

Liu Ping, Tan Xianfeng, Chen Qing, Wang Jia, Liang Mai, Wang Ping, Wang Weiqing. Water redox conditions and environment for source rock deposition in lacustrine during the Initial Eocene Thermal Maximum(IETM): A case study on the Paleogene Kongdian Formation in the Dongying Sag[J]. Oil & Gas Geology, 2017, 38(1): 39-48,143.

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Water redox conditions and environment for source rock deposition in lacustrine during the Initial Eocene Thermal Maximum(IETM): A case study on the Paleogene Kongdian Formation in the Dongying Sag

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