DIAGENESIS OF RESERVIORS IN FUYU AND YANGDACHENGZI OF SANZHAO REGION

王宝清; 徐文发; 刘站立; 孔繁忠; 常中原; 王春瑞

doi:10.11743/ogg20010120

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DIAGENESIS OF RESERVIORS IN FUYU AND YANGDACHENGZI OF SANZHAO REGION
Vol. 22, Issue 1, Pages: 82-87(2001)
Online First：25 March 2001，

Published：2001
DOI： 10.11743/ogg20010120
稿件说明：

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DOI：

王宝清, 徐文发, 刘站立, et al. DIAGENESIS OF RESERVIORS IN FUYU AND YANGDACHENGZI OF SANZHAO REGION[J]. 2001, 22(1): 82-87. DOI： 10.11743/ogg20010120.

摘要

三肇地区下白垩统扶余和杨大城子油层储集岩主要为具有较高杂基含量的岩屑长石细砂岩和长石岩屑细砂岩.孔隙度在1%～21.3%之间

平均10.9%.渗透率在0.01×10

-3

～289×10

-3

μm

之间

平均1.53×10

-3

μm

.主要的成岩作用有压实作用、胶结作用、溶蚀作用、交代作用等.压实作用使孔隙大大减少;根据结构、阴极发光特征、碳氧稳定同位素成分、主要元素和微量元素含量可以推测方解石胶结物形成于早成岩作用的还原条件下

方解石胶结物的沉淀使沉积物(岩)的孔隙减少;长石和中基性火山岩岩屑的溶蚀产生的孔隙约占现有孔隙的1/3;交代作用使大部分蒙皂石和高岭石已转变为伊利石和伊蒙混层

或绿泥石和绿蒙混层

对储集空间发育的影响不大.大部分储集岩的变化发生在早成岩作用阶段.

Abstract

The reservoir rocks of Lower Cretaceous Fuyu and Yangdachenzi unites wrer deposited in channels on the deltaic flood plain in Sanzhao area. The reservoir rocks mainly consist of fine lithic arkose and feldspathic litharenite with abundant matrix.Porosity ranges from 1% to 21.3%

with a mean of 10.9%.Permeability ranges from 0.01×10

-3

to 289×10

-3

μm

with a mean of 1.53×10

-3

μm

.Main diagenesis includes compaction

cementation

dissolution

replacement and recrystallization.According to the texture;cathodoluminescence characteristics

carbon and oxygen isotopic composition

the contents of the main and trace elements

calcite cement formed in reducing condition during early diagenesis. Precipitation of calcite cement caused the decrease of porosity in sediments.Porosity formed by feldspar and intermediate/basic volcanic rock fragment dissolution makes up about one third of the whole porosity.Most smectite and kaolinite already changed into illite and chlorite

or mixed layered illite/smectite(I/S)and chlorite/smectite(C/S).Most changes of reservoir rocks occurred during early diagenesis.