膏盐岩油气封盖性研究进展

doi:10.11743/ogg20160503

Abstract

Abstract: Gypsolyte/saline rocks are one of the most important hydrocarbon cap rocks worldwide.More and more exploration cases indicate that their sealing properties are highly variable from well to well.To better understand the rocks and its implication as cap rocks,we present in this article an overview of the research advances in the industry.It shows that these rocks are mostly originated from evaporitic basins and sabkhas,largely presented themselves as annular rings or bands parallel to shorelines.The rocks of the former origin have been considered ideal cap rocks as they are usually widely distributed and big in thickness.The sealing mechanisms of the gypsolyte/saline rocks may be summarized as favorable physical properties,overpressure and plasticity.The dissolution of the rocks was recorded vertically by four zones:top dissolution zone,fault dissolution zone,intra-layer water dissolution zone and bottom dissolution zone,and horizontally by three zones:karst uplift,karst slope and karst basin.Many factors,such as the distribution area,integrity,thickness and etc.(the internal controlling factors for sealing properties),shall be taken into consideration during the evaluation of sea-ling properties of the rocks.The impacts of dissolution and tectonism (external controlling factors for sealing properties) on the sealing properties of the rocks are then analyzed.Current research is focused more on quantitative evaluation of the sealing capacity of the rocks,especially the impacts of dissolution and tectonism.The research is still in a stage of exploration and it is both challenging and exciting.

Key words: effective juxtaposition thickness, dissolution, tectonism, gypsolyte/saline rock, evaporitic basin, hydrocarbon cap rock

CLC Number:

TE122.2

Li Yonghao, Cao Jian, Hu Wenxuan, Lu Xiancai, Fan Ming, Zhang Dianwei, Hong Dongdong. Research advances on hydrocarbon sealing properties of gypsolyte/saline rocks[J]. Oil & Gas Geology, 2016, 37(5): 634-643.

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Research advances on hydrocarbon sealing properties of gypsolyte/saline rocks

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