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| Genetic model of salt-gypsum rock of Paleogene in Dongying depression and its relationship with hydrocarbon reservoir |
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XU Lei1,CAO Ying-chang1,WANG Yan-zhong1,HUANG Long2
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(1. Faculty of Geo-Resource and Information in China University of Petroleum, Dongying 257061, Shandong Province, China ;2. School of Resource and Information Technology in China University of Petroleum，Beijing 102249, Chirm)
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| Abstract: |
| The vertical sequence，plane distribution，material source，formation environment，control genesis of the salt-gypsum rock in Dongying depression and its relationship with hydrocarbon reservoir were studied by means of drilling data analysis, cores observation, geochemical research as well as the analysis of palaeostructure, palaeoclimate and palaeosalinity of the area. The results show that four thick bedded salt-gypsum rocks developed in member 1 of Kongdian formation and member 4 of Shahejie formation in Dongying depression. In the vertical direction, mudstone-halite-gymsum-carbonatite are deposited successively upward. And the plane distribution is so comprehensive that salt-gypsum rock can be found all over the depression. The salts are continental source and come from the Cambrian and Ordovician systems of the surrounding uplifts. Along with the evolution of palaeoIake,the depositional environment of salt-gypsum rock varies from " shallow water evaporate" to ” deep water evaporate". The deposition of the salt-gypsum rock is mainly controlled by palaeoclimate and provenance. As a result of the mothballing of the salt-gypsum rock，two independent hydrocarbon-bearing systems developed in the Kongdian formation and member 4 of Shahejie formation^ |
| Key words: Dongying depression Paleogene salt-gypsum rock genetic model hydrocaiiwn-bearing system |
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