沉积与特提斯地质
沉積與特提斯地質
침적여특제사지질
SEDIMENTARY GEOLOGY AND TETHYAN GEOLOGY
2014年
2期
72-78
,共7页
储层%沉积相%苏维依组%天山南地区
儲層%沉積相%囌維依組%天山南地區
저층%침적상%소유의조%천산남지구
reservoir%sedimentary facies%Suweiyi Formation%southern Tianshan Mountains
根据钻井、测井与分析测试等资料，研究了塔里木盆地天山南缘区块北带苏维依组的沉积相带和储层特征。苏维依组分为下部底砂岩段和上部的膏泥岩段，在研究区主要发育辫状河三角洲和湖泊沉积体系。本区储层多为粉砂岩、细砂岩、中砂岩和含砾砂岩，主要岩石类型为长石石英砂岩和岩屑长石砂岩。孔隙类型主要是原生粒间孔、溶蚀孔，还有裂缝和微孔隙等。底砂岩段储层物性较好，总体属于中孔-中、低渗储层，非均质性较强，其中以三角洲前缘的分流河道和席状砂微相砂体物性最好。影响研究区储层物性的主要因素有沉积相带、成岩作用等，压实作用、溶蚀作用和胶结作用是对储层物性影响最大的成岩作用。
根據鑽井、測井與分析測試等資料，研究瞭塔裏木盆地天山南緣區塊北帶囌維依組的沉積相帶和儲層特徵。囌維依組分為下部底砂巖段和上部的膏泥巖段，在研究區主要髮育辮狀河三角洲和湖泊沉積體繫。本區儲層多為粉砂巖、細砂巖、中砂巖和含礫砂巖，主要巖石類型為長石石英砂巖和巖屑長石砂巖。孔隙類型主要是原生粒間孔、溶蝕孔，還有裂縫和微孔隙等。底砂巖段儲層物性較好，總體屬于中孔-中、低滲儲層，非均質性較彊，其中以三角洲前緣的分流河道和席狀砂微相砂體物性最好。影響研究區儲層物性的主要因素有沉積相帶、成巖作用等，壓實作用、溶蝕作用和膠結作用是對儲層物性影響最大的成巖作用。
근거찬정、측정여분석측시등자료，연구료탑리목분지천산남연구괴북대소유의조적침적상대화저층특정。소유의조분위하부저사암단화상부적고니암단，재연구구주요발육변상하삼각주화호박침적체계。본구저층다위분사암、세사암、중사암화함력사암，주요암석류형위장석석영사암화암설장석사암。공극류형주요시원생립간공、용식공，환유렬봉화미공극등。저사암단저층물성교호，총체속우중공-중、저삼저층，비균질성교강，기중이삼각주전연적분류하도화석상사미상사체물성최호。영향연구구저층물성적주요인소유침적상대、성암작용등，압실작용、용식작용화효결작용시대저층물성영향최대적성암작용。
Sedimentary facies and hydrocarbon reservoirs from the Palaeogene Suweiyi Formation in southern Tianshan Mountains, Tarim Basin, Xinjiang are examined on the basis of lithologic and physical properties of the hydrocarbon reservoirs. The Suweiyi Formation is separated into two parts:sandstone intervals in the lower part and gypsum mudstone intervals in the upper part, and composed of braided delta and lake depositional systems. The hydrocarbon reservoirs mostly consist of siltstone, fine-grained sandstone, medium-grained sandstone, and gravel-bearing sandstone, including feldspar quartz sandstone and lithic feldspar sandstone. The porosity types contain the primary intergranular pores and solution openings, and cracks and microcracks. On the whole, the basal sandstones especially the delta front distributary channel and sheet sandstones with excellent physical properties belong to the medium-porosity and medium-to low-permeability reservoirs with heavy heterogeneity. The main influencing factors include sedimentary facies and diagenesis in which compaction, dissolution and cementation are believed to be the main diagenetic effects.
