DIAGENESIS AND POROSITY EVOLUTION OF SHAXIMIAO FORMATION IN LUODAI GAS FIELD OF THE WEST SICHUAN
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摘要: 通过薄片观察、鉴定可知,洛带气田中侏罗统沙溪庙组储层原生粒间孔普遍发育,次生孔隙类型多而复杂,成岩作用以及填隙物成分对孔隙度影响较大。经粘土矿物X衍射和扫描电镜分析,将成岩阶段划分为早成岩A期、B期和中成岩A期、B期4个期次。早成岩A期,压实作用和石英Ⅰ级次生加大使原生孔隙度迅速降低至10%~15%左右;早成岩B期,碳酸盐胶结物和硬石膏胶结物大量出现,孔隙度丧失至不足10%;到中成岩A期,由于强酸性水的存在,开始出现Ⅱ级石英加大边和自生高岭石沉淀;中成岩B期,溶蚀作用不断加强,对孔隙改善作用明显;整个中成岩阶段,孔隙不断的消长演化,孔隙度下降到4%~9%,并最终形成低孔低渗的致密性储层。Abstract: From the analysis of thin section,it shows widely growing primary porosity and complicate secondary porosity in Shaximiao Fm of Middle Jurassic,Luodai Gas Field of the West Sichuan.Diagenesis and interstitial matter have great influence on porosity.Based on the X ray diffraction of Clay mineral and the scanning electron microscopic,the diagenetic stages here are Classified as earlier diagenetic A,B and middle diagenetic A,B.In the earlier diagenetic A,the primary porosity decreased rapidly to 10%～15% because of compaction and quarts growth Ⅰ.And in the earlier diagenetic B,the porosity is evaluated to hit 10% because of arise of carbonate and muriacite cementations.Then quarts growth Ⅱ occurred in heavy acidulous water and authigenic kaolinite deposited in the middle diagenetic A.Until the middle diagenetic B,the porosity were improved by the enhancement of denudation.During the whole middle digenetic stage,the porosity descented to 4%～9% after constant decrease and increase.After a series of diagenetic stages,the reservoirs were densified to low porosity and low permeability ones.
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Key words:
- primary porosity /
- secondary porosity /
- porosity evolution /
- diagenesis /
- Luodai Gas Filed /
- the West Sichuan /
- the Sichuan Basin
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[1] 罗啸泉.成都市洛带地区沙溪庙组沉积相及储集条件分析[J].四川地质学报,2005,25(1):4～7 [2] 曾小英.川西坳陷上侏罗统蓬莱镇组砂岩储层的成岩作用及对成藏的影响[J].矿物岩石,1999,19(4):47～51 [3] 刘建清,赖兴运,于炳松等.成岩作用的研究现状及展望[J].石油实验地质,2006,28(1):65～72 [4] 曹伟,刘纪常,陈伟明.成都洛带气田蓬莱镇组储层特征[J].石油与天然气地质,1999,20(1):80～83 [5] 杨诚,耿旗,何鲤等.川西坳陷洛带气田沙溪庙组天然气成藏规律[J].油气地质与采收率,2001,8(4):38～40 [6] Lundegard Paul D.Sandstone porosity loss; a"big picture" view of the importance of compaction[J].Journal of Sedimentary Research,1992,62:250～260 [7] Scherer M.Parameters influencing porosity in sandstone:a model for sandstone porosity prediction[J].The AAPG Bulletin,1987,71(5):485～491 [8] 吕正祥.川西孝泉构造上三叠统超致密储层演化特征[J].成都理工大学学报(自然科学版),2005,32(1):22～26 [9] 朱彤.成岩作用对致密砂岩储层储集性的控制作用研究:以川西新场气田上沙溪庙组气藏为例[J].成都理工学院学报,1999,26(2):157～160 [10] 程晓玲.粘土矿物成岩作用对油气储集性和产能的影响:以苏北盆地台兴油田阜三段储层为例[J].石油实验地质,2003,25(2):164～168 [11] 程晓玲,何将启,梁世友.粘土矿物在储层定量评价及预测中的应用:以苏北盆地台兴油田阜三段储层为例[J].油气地质与采收率,1999,6(3):21～23 [12] 姜辉,于兴,施和生等.珠江口盆地PY30-1气田陆相石英砂岩储集层成岩作用研究[J].石油勘探与开发,2005,32(5):51～55 [13] 刘树根,李国蓉,李巨初等.川西前陆盆地流体的跨层流动和天然气爆发式成藏[J].地质学报,2005,79(5):690～699 [14] 穆曙光,张以明.成岩作用及阶段对碎屑岩储层孔隙演化的控制[J].西南石油学院学报,1994,16(3):22～27 -
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