渤中凹陷东营组古沉积环境及烃源岩发育模式

doi:10.12108/yxyqc.20210609

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 81-92.doi: 10.12108/yxyqc.20210609

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Paleoenvironment and development model of source rocks of Dongying Formation in Bozhong Sag

YANG Hong^1,2, LIU Chenglin^1,2, WANG Feilong³, TANG Guomin³, LI Guoxiong^1,2, ZENG Xiaoxiang^1,2, WU Yuping^1,2

1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
3. Tianjin Brach of CNOOC, Tianjin 300452, China

Received:2021-07-15 Revised:2021-08-14 Online:2021-12-01 Published:2021-11-25

Abstract

Abstract: The source rocks of Dongying Formation are relatively thick in Bozhong Sag. It is of great significance to clarify the characteristics and development model of this set of source rocks for promoting three-dimensional conventional and unconventional hydrocarbon exploration in deep and shallow layers of Bozhong Sag. Organicinorganic geochemical experiments, whole rock-clay and sporo-pollen analysis tests were carried out on the source rock samples to evaluate the quality of the source rock of Dongying Formation in Bozhong Sag. Combined the ratios of Sr/Cu, Mn/Fe and Pr/Ph, Gammacerane index, cycloterpane ratio, carbon isotope and low algal pollen content, the paleoenvironment and paleo-productivity during the formation of Dongying Formation were analyzed, and a unique source rock development model of Dongying Formation was established. The results show that: (1) The mudstone of Dongying Formation is mainly composed of quartz and feldspar, with low content of carbonate minerals and high content of clay minerals(with a mass fraction of 30%). (2) The organic matter abundance in the lower part of the third and second members of Dongying Formation is high, reaching the maturehigh maturity stage, and the organic matter is mainly Ⅱ₁-Ⅱ₂ type. (3) The paleoclimate of Dongying Formation is warm and humid, the water salinity gradually becomes lighter, and the water depth gradually becomes shallower, from the high water depth of E₃d₃(70.1 m) to the low water depth of E₃d₁(26.7 m). The terrestrial intrusion and water oxidation conditions gradually increase, and the paleo-productivity successively is E₃d₃(high) > E₃d₂(middle) > E₃d₁(low). (4) High productivity and reductive preservation conditions dominate the enrichment of organic matter in Dongying Formation, while paleoclimate, water depth, salinity and terrigenous input have indirect effects on the enrichment of organic matters.

Key words: source rocks, paleoenvironment, development model, Dongying Formation, Bozhong Sag

CLC Number:

TE122.2

YANG Hong, LIU Chenglin, WANG Feilong, TANG Guomin, LI Guoxiong, ZENG Xiaoxiang, WU Yuping. Paleoenvironment and development model of source rocks of Dongying Formation in Bozhong Sag[J].Lithologic Reservoirs, 2021, 33(6): 81-92.

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