蒙古塔木察格盆地塔南凹陷下白垩统南屯组三角洲沉积及储层特征
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摘要
塔南凹陷为蒙古国塔木察格盆地的次级凹陷,盆地内发育三角洲沉积,且钻遇大规模油藏。综合利用地震、测井和岩心等资料,对塔南凹陷南屯组三角洲的沉积特征、展布、演化及储层物性进行研究。结果表明:本区三角洲可识别出三角洲平原、三角洲前缘和前三角洲3种亚相及6种微相,且集中发育于盆地的西北部;三角洲砂体的规模从南屯组初期到末期整体表现为逐渐扩张的趋势,加积和前积作用使得沉积范围迅速扩大。三角洲砂岩孔渗研究发现,塔南凹陷三角洲前缘砂体储层类型整体属于中孔超低渗型,水下分流河道砂体的孔隙度主要集中在17%～20%,渗透率主要集中在0.1×10~(-3)～10×10~(-3)μm~2,储集物性好;席状砂的孔隙度主要集中在15%～16%和19%～21%,渗透率主要集中在0.1×10~(-3)～5×10~(-3)μm~2,储集物性次之;河口坝砂体的储集物性最差,孔隙度主要集中在13%～17%,渗透率主要集中在0.1×10~(-3)～5×10~(-3)μm~2。
Ta'nan sag was a sub-sag of Tamtsag Basin in Mongolia,in which developed delta facies and contained large-scale reservoirs.Through the comprehensive utilization of seismic,well logging and core data,the authors studied the sedimentary characteristics,distribution,evolution and reservoir property of delta in Nantun Formation of Ta'nan sag.The results showed that the delta in this area can be divided into three kinds of subfacies (delta plain,delta front,prodelta) and six kinds of microfacies,which are mostly located in the northwest of the basin.The scale of delta sand expanded gradually from the early stage to the last stage of Nantun Formation and the sedimentary range increased rapidly by aggradation and progradation.The porosity-permeability analysis of delta sandstone showed that the sand reservoir type of delta front in Ta'nan sag belonged to medium porosity and super- low permeability type.The porositv and permeability of underwater distributary channel sand ranged from 17%to 20%and 0.1×10~(-3) to 10×10~(-3)μm~2 with the best reservoir property;the porosity and permeability of sheet sand ranged from 15%to 16%,19%to 21%and 0.1×10~(-3) to 5×10~(-3)μm~2 with better reservoir property;the porosity and permeability of river mouth bar sand ranged from 13%to 17%and 0.1×10~(-3) to 5×10~(-3)μm~2 with the worst reservoir property.
Ta'nan sag was a sub-sag of Tamtsag Basin in Mongolia,in which developed delta facies and contained large-scale reservoirs.Through the comprehensive utilization of seismic,well logging and core data,the authors studied the sedimentary characteristics,distribution,evolution and reservoir property of delta in Nantun Formation of Ta'nan sag.The results showed that the delta in this area can be divided into three kinds of subfacies (delta plain,delta front,prodelta) and six kinds of microfacies,which are mostly located in the northwest of the basin.The scale of delta sand expanded gradually from the early stage to the last stage of Nantun Formation and the sedimentary range increased rapidly by aggradation and progradation.The porosity-permeability analysis of delta sandstone showed that the sand reservoir type of delta front in Ta'nan sag belonged to medium porosity and super- low permeability type.The porositv and permeability of underwater distributary channel sand ranged from 17%to 20%and 0.1×10~(-3) to 10×10~(-3)μm~2 with the best reservoir property;the porosity and permeability of sheet sand ranged from 15%to 16%,19%to 21%and 0.1×10~(-3) to 5×10~(-3)μm~2 with better reservoir property;the porosity and permeability of river mouth bar sand ranged from 13%to 17%and 0.1×10~(-3) to 5×10~(-3)μm~2 with the worst reservoir property.
引文
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[2]马正.应用自然电位测井曲线解释沉积环境[J].石油与天然气地质,1982,3(1):25-40. MA Zheng.Utilization of the combination of log shapes for explanation of the sedimentary environment[J].Oil & Gas Geology,1982,3(1):2540.
[3]Collinson J D,Thompson D B.沉积构造[M].付泽明,李惠生,译.北京:地质出版社,1988:1-91. Collinson J D,Thompson D B.Sedimentary structures [M].FU Ze-ming,LI Hui-sheng,translated.Beijing: Geological Publishing House,1988:1-91.
[4]李维锋,高振中,彭德堂,等.库车坳陷中生界三种类型三角洲的比较研究[J].沉积学报,1999,17 (3):430-434. LI Wei-feng,GAO Zhen-zhong,PENG De-tang,et al. Comparative study of fan-deltas,braided-river deltas and meandering-river deltas of Mesozoic Erathem in Kuche depression,Tarim Basin[J].Acta Sedimentologiea Sinica, 1999,17(3):430-434.
[5]薛良清,Ga11owa W E.扇三角洲、辫状河三角洲与三角洲体系的分类[J].地质学报,1991,65(2): 141-153. XUE Liang-qing,Galloway W E.Fan delta,braid delta and the classification of delta systems[J].Acta Sedimentologica Sinica,1991,65(2):141-153.
[6]刘招君,孙平昌,杜江峰,等.汤原断陷古近系扇三角洲沉积特征[J].吉林大学学报:地球科学版, 2010,40(1):1-8. LIU Zhao-jun,SUN Ping-chang,DU Jiang-feng,et al. Sedimentary characters of fan delta of Paleocene in Tangyuan fault depression[J].Journal of Jilin University: Earth Science Edition,2010,40(1):1-8.
[7]于兴河.碎屑岩系油气储层沉积学[M].北京:石油工业出版社,2002:402-420. YU Xing-he.Clastic petroleum reservoir sedimentology [M].Beijing:Petroleum Industry Press,2002:402- 420.
[8]裘亦楠.中国陆相碎屑岩储层沉积学的进展[J].沉积学报,1992,10(3):16-24. QIU Yi-nan.Developments in reservoir sedimentology of continental clastic rocks in China[J].Acta Sedimentologica Sinica,1992,10(3):16-24.
[9]蒋凌志,顾家裕,郭彬程,等.中国含油气盆地碎屑岩低渗透储层的特征及形成机理[J].沉积学报, 2004,22(1):13-18. JIANG Ling-zhi,GU Jia-yu,GUO Bin-cheng,et al. Characteristics and mechanism of low permeability clastic reservoir in Chinese petroliferous basin[J].Acta Sedimentologica Sinica,2004,22(1):13-18.
[10]马琳,郭巍,刘群,等.伊通盆地鹿乡断陷双阳组储层孔隙结构特征及其控制因素[J].世界地质, 2010,29(2):284-291. MA Lin,GUO Wei,LIU Qun,et al.Pore structure characteristics and controlling factors of Shuangyang Formation reservoir in Luxiang fault depression,Yitong Basin [J].Global Geology,2010,29(2):284-291.
[11]赵澄林,胡爱梅,陈碧压.中华人民共和国石油天然气行业标准SY/T 6285-1997油气储层评价方法[S].北京:石油工业出版社,1994:7-9. ZHAO Cheng-lin,HU Ai-mei,CHEN Bi-ya.Oil and gas industry standard of the People's Republic of China SY/T6285 -1997 evaluating methods of oil and gas reservoirs [S].Beijing:Petroleum Industry Press-.1994,7- 9.
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