Oil & Gas Geology ›› 2019, Vol. 40 ›› Issue (1): 109-122.doi: 10.11743/ogg20190111

• Petroleum Geology • Previous Articles     Next Articles

Sedimentary strata and organic matter features of the Cretaceous Laiyang Group in eastern Shandong Province

Zhou Yaoqi1,2,3, Gu Yangjian1,2,3, Zhou Tengfei1,2,3, Yue Huiwen4, Li Manjie1,2,3, Yin Xingcheng1,2,3, Liang Zhao1,2,3, Cao Mengchun1,2,3, Dong Shihui1,2,3   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
    3. Collaborative Innovation Center for Deep Resources Exploration Theory and Technology, Qingdao, Shandong 266580, China;
    4. GFZ German Research Centre for Geoscience, Section 3.2 Organic Geochemistry, D-14473 Potsdam, Germany
  • Received:2018-09-13 Revised:2018-10-10 Online:2019-02-28 Published:2018-12-08

Abstract:

The organic matter features of the Laiyang Group in Lingshan Island were systematically studied by means of sedimentology, sedimentary geochemistry and organic geochemistry and integrating with typical outcrop observation in Lingshan Island,Laoshan Yakou-Baxiandun area and Jiaolai Basin and the previous research on the elemental geochemistry of Lingshan Island and the organic geochemistry of Jiaolai Basin. In Jiaolai Basin,the terrestrial strata of fluvial and lacustrine facies and alluvial fan facies were developed in the Early Cretaceous Laiyang period.The organic geochemistry studies on the deposits show that the source rock samples from the Shuinan section are mainly of saprolite(Type Ⅰ)and humus and saprolite (Type Ⅱ1),have entered the hydrocarbon generation threshold and are in the thermal mature stage;while in the Lingshan Island,LaoshanYakou-Baxiandun areas,marine strata dominated by deep sea gravity flow and deep water traction current deposits were developed in the Early Cretaceous Laiyang period.Meanwhile the elemental geochemical studies on siltstones and shales of Lingshan Island reveal that its sedimentary setting is a marine reducing environment,and the organic geochemical research shows that samples from Lingshan Island belong to the humic(Type Ⅲ)and humic and sapropel (Type Ⅱ1)types in high to over mature stage,and the turbidites of Lingshan Island may have completed the process of hydrocarbon generation and expulsion.

Key words: organic feature, sedimentary stratum, Laiyang Group, Jiaolai Basin, eastern Shandong Province

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