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地质科学  1998, Vol. Issue (2): 244-250    DOI:
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砂岩储层孔隙保存的定量预测研究
寿建峰, 朱国华
杭州石油地质研究所 杭州 310023
STUDY ON QUANTITATIVE PREDICTION OF POROSITY PRESERVATION IN SANDSTONE RESERVOIRS
Shou Jianfong, Zhu Guohua
Hangzhou institute of petrolemu geology, Hangzhou 310023
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摘要 对北方地区若干盆地的砂岩孔隙发育特征的研究表明,地温场、地质年代和盆地沉降方式对砂岩孔隙的演化和保存有制约作用。地温梯度每增加1℃,砂岩孔隙度平均减小约7%;在地温梯度2-4℃/100m范围内,有效储层的保存深度差异可达2500-3000m.地质年代每增加1Ma,砂岩孔隙度降低约0.018%-0.009%.地层超压可最大保存5%-7%的孔隙度。盆地沉降方式不同引起的孔隙保存量的差异为2%-5%,相应的有效孔隙保存深度的差值约1000m。
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寿建峰
朱国华
关键词地温场   地质时间   沉降方式   热成熟度   孔隙度预测   砂岩储层     
Abstract: The porosity preservation and evolution of sandstone are mainly controlled by geotemperature field,geologic age and subsidence styles,in which geotemperature field is the most important parameter.It is found that average porosity of sandstone decreases by 70%± as average geotemperature gradient increases by 1℃/100m,in which ddecreasing rate of sandstone porosity in high geotemperature gradient area(e.g.4.0℃/100m),with increasing burial depth,is about 3-4 times that in low geotemperature gradient area(e.g.2℃1/100m).As a result,the same porosities may correspond to different burial depths ranging from 2500 to 3000m under geotemperature gradients between 2-4℃/100m.It is also presented that decreasing rate of sandstone porosities with increasing geologic age is about 0.018%-0.009% per million years,which shows that the effects to porosities resulting from geologic age and geotemperature.are supplimentary to one another. Furtherly,the relation between geotemerature geologic age and porosity is established and may be applied to quantiative prediction of underground sandstone porosity.Basin subsidence styles also have an evident even key influence on porosity preservation.It is indicated that sandstone porosity may be preserved by 2%-5% due to subsidence style change,in which burial depth difference of effective reservoirs may reach 100m.An integrated study of the above three parameters amy well explain why high porosity but deep burial reservoirs occur in basins in the western China,characterized by low geotemperature field and low porosity but shallow burial reservoir in basins in the eastern China,with high geotemperature field.In addition,the dynamic relation between porosity and the above three parameters may be more accurately described by time temperature index(TTI)presented by Lopatin.Quantitative relations between thermal matutrity porosity,thermal maturity and burial depth,thermal maturity and effective sandstone ratio for the three types.of sandstones have been established in this paper,which may exactly predict porosity,burial depth and ratio of effective reservoirs for exploration,and have been proved to be an effective method in reservoir evaluation.
Key wordsGeotemperature field   Geologic age   Subsidence style   Thermal maturity   Porosity prediction   Sandstone reservoirs   
收稿日期: 1996-10-08;
基金资助:国家“八五”攻关项目《塔里木盆地油气资源》子项研究成果
引用本文:   
寿建峰,朱国华. 1998, 砂岩储层孔隙保存的定量预测研究. 地质科学, (2): 244-250.
Shou Jianfong,Zhu Guohua. STUDY ON QUANTITATIVE PREDICTION OF POROSITY PRESERVATION IN SANDSTONE RESERVOIRS[J]. Chinese Journal of Geology, 1998, (2): 244-250.
 
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