还原性流体-泥岩盖层相互作用的岩石学和地球化学记录——以松辽盆地南部王府凹陷青山口组泥岩为例

doi:10.11743/ogg20170514

Abstract

Abstract: Reducing fluids percolated from natural gas reservoirs or fields may cause composition variation (especially the macro and trace elements) of mudstone caprocks.The variation records the interaction between the reducing fluids and mudstone caprocks and may be used as an indicator of the locations of oil and gas reservoirs.By resorting to natural analogy,we studied the mudstone samples from the the Qingshankou Formation of Wangfu Depression in southern Songliao Basin to analyze the variation of mudstone composition caused by reducing fluids and the migration of the fluids in cap rocks of gas fields (reservoirs).The results show that the reducing components in the fluids are mainly methane,followed by hydrogen sulfide.During the fluid-rock interaction process,the red Fe³⁺ in the mudstone was reduced to colorless Fe²⁺,causing a phenomenon called bleach.The Fe²⁺ then migrated in the form of colloids with the fluids and reprecipitaed as iron concretions elsewhere.During the bleach process,the increasing U content,and decreasing Ga and Sc contents,as well as the veritical changes of the U,Mo,V and Ni contents,are suggested to be connected with the reductivity of the fluids.In mudstone caprocks,the reducing fluids were driven by buoyancy to migrate vertically and the uplifting of strata might cause dropping of fluid surface.The regular variation of trace elements in the mudstone caprocks may be used as indicators to the flow pathways and directions of the reductive fluids.

Key words: mudstone caprock, reducing fluid, bleached mudstone, iron concretion, natural analogy, natural gas field (reservoir), Songliao Basin

CLC Number:

TE122.1

Ming Xiaoran, Liu Li, Song Tushun, Liu Na, Yang Huidong, Yu Lei, Bai Hanggai. Petrologic and geochemical records of interaction between reducing fluids and mudstone caprocks:A case from the mudstone in the Qingshankou Formation of Wangfu Depression in southern Songliao Basin[J]. Oil & Gas Geology, 2017, 38(5): 952-962.

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Petrologic and geochemical records of interaction between reducing fluids and mudstone caprocks:A case from the mudstone in the Qingshankou Formation of Wangfu Depression in southern Songliao Basin

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