川东北地区飞仙关组成岩晚期白云石溶解作用

doi:10.11743/ogg20120415

Abstract

Abstract:

Comprehensive analyses were performed on thin-section,carbon,oxygen and strontium isotopes and fluid inclusions of reservoirs in the Feixianguan Formation of northeastern Sichuan Basin.In the northeastern part of Kaijiang-Liangping shelf,intercrystalline pores resulting from dolomitization of calcite are absent in the high-quality reservoirs.In contrast,dolomite intergranular dissolution pores or intergranular enlarged dissolution pores are well developed in these reservoirs.Both two kinds of dissolution pores may coexist closely with calcites of light carbon isotope and occur in space between solid bitumen and dolomite crystals,thus they should have been produced by dolomite dissolution after solid bitumen precipitation.In the southern part of Kaijiang-Liangping shelf,dolostones are absent,thus pores of similar origin are also not developed.Under acidic conditions,dolomite may react with anhydrite or celestite,to produce MgSO₄ in the northeastern part of Kaijiang-Liangping shelf.As the MgSO₄ can be easily reduced by hydrocarbons to produce H₂S, further promoting the dissolution of dolomite,anhydrite and celestite,the precipitation of giant crystal/poikilitic calcite,and the enlarging of secondary pores in local areas.This genetic mechanism can clearly explain the differences of reservoir physical properties between the northeastern and northwestern areas.The MgSO₄ is likely to be the primary intermediate reactants of TSR.

Key words: dolomite dissolution, porosity evolution, diagenesis, TSR, Feixianguan Formation, northeastern Sichuan Basin

CLC Number:

TE121.1

Zhang Jun, Cai Liulu, Xiang Lei, Cai Chunfang. Late diagenetic dissolution of dolomites in the Feixianguan Formation, northeastern Sichuan Basin[J]. Oil & Gas Geology, 2012, 33(4): 599-606.

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Late diagenetic dissolution of dolomites in the Feixianguan Formation, northeastern Sichuan Basin

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