热液白云岩发育模式——以扎格罗斯盆地白垩系A油田为例

doi:10.11743/ogg20150307

Abstract

Abstract: Based on core petrographic description, fracture statistics, comprehensive interpretation of seismic and logging data, analogues with other confirmed examples, this paper analyzed the identification marks, development timing, genetic model and distribution of the hydrothermal dolomitization and its alteration on the reservoir quality, so as to analyze the abnormal distribution of dolomite in the Kometan Formation of the Cretaceous oilfield A in Zagros Basin.The most part of Kometan Formation and the lower part of the Shiranish Formation in two wells were altered by hydrothermal dolomitization.The matrix limestone there was replaced by hydrothermal flow with the crystal intergrowth, half automorphic, and coarse grain dolomite.Early extensional fractures were filled with saddle dolomite and anhydrite.Celestine-saddle dolomite-anhydrite is the main hydrothermal mineral assemblage and can be used to identify the hydrothermal origin.The hydrothermal dolomitization preferentially flow upwards along the extensional and transtensional fault systems, where dolomitization mainly occurs on the hanging walls(graben)and extends laterally in the porous and permeable layers.In this case, the geometry of altered rocks was with stratification, the limestone strata near the fractured zone were also altered by hydrothermal dolomitization which display great irregularity. The alteration of hydrothermal dolomitization on reservoir is complicated.The dolostone formed along the main fault has lower matrix porosity than dolomite a little far from main faults, because over-dolomitization usually happened in the position with more active hydrothermal fluid flow.Local reservoir quality is obviously improved with matrix porosity of about 6%.The dolomite is generally more fractured than the limestone, so dolomitization has greatly increased the fracture density and improve the flow capacity of the reservoir.This study is significant for reservoir modeling and production strategies.

Key words: fracture, hydrothermal dolomitization, genetic model, carbonate, Cretaceous, Zagros Basin

CLC Number:

TE122.1

Zhang Tao, Su Yushan, She Gang, Ahemaitijiang, Zhang Demin. A study on the genetic model of hydrothermal dolomitization in Taq Taq oilfield, Kurdistan region,Iraq—taking oilfield A in the Cretaceous in Zagros Basin as an example[J]. Oil & Gas Geology, 2015, 36(3): 393-401.

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A study on the genetic model of hydrothermal dolomitization in Taq Taq oilfield, Kurdistan region,Iraq—taking oilfield A in the Cretaceous in Zagros Basin as an example

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