南华北盆地谭庄凹陷下白垩统储集体成因类型及特征  

SEDIMENTARY TYPES AND CHARACTERISTICS OF LOWER CRETACEOUS RESERVOIR ROCKS IN TANZHUANG SAG,ZHOUKOU DEPRESSION,SOUTHERN NORTH CHINA BASIN

作　　者：陈祥[1] 张琴[2] 朱筱敏[2] 王勋杰 季汉成[2] 蒋永福[1] 

机构地区：[1]河南石油勘探局,河南南阳473132 [2]油气资源与探测国家重点实验室(中国石油大学),北京102249 [3]长城钻探工程有限公司,北京100101

出　　处：《石油实验地质》2010年第2期124-129,共6页Petroleum Geology & Experiment

摘　　要：依据岩心及钻测井、分析化验等资料,对南华北盆地周口坳陷谭庄凹陷下白垩统储集体成因类型及物性特征进行了研究。谭庄凹陷在早白垩世存在南、北两大物源,南部以发育来自南部物源的扇三角洲为主,北部以发育来自北部及西北部物源的三角洲为主,盆地中心主要为湖相和滑塌浊积扇沉积。储集体主要由砂砾岩和砂岩组成,其中细砂岩发育最多,其次为砂砾岩及砾岩;岩石的结构和成分成熟度都较低。本区碎屑岩储集物性普遍较差,这与岩石较低的成熟度、较强的压实作用和胶结作用及较弱的溶蚀作用有关。不同成因类型储集体其物性存在一定差别。其中2 200 m以上的三角洲平原砂体储集物性较好,但随着埋深的增加,物性迅速降低。在相同的深度,从扇三角洲前缘、扇三角洲平原、滨浅湖储集物性依次降低。Sedimentary types and properties of the Lower Cretaceous clastic rock reservoirs in the Tanzhuang Sag,Zhoukou Depression,Southern North China Basin are studied in this paper based on data of core,well logging and thin-section.Two ways of sediment provenance exist in the Tanzhuang Sag during the Early Cretaceous.The south of the basin mainly develop fan delta facies from south.The north of the basin mainly develop delta facies from north and northwest.The center of the basin mainly develop lacustrine and turbidite fan.Reservoir rocks consist of glutenite and sandstone with low componential and textural maturities.Fine sandstone is the dominant rock type.Clastic reservoir properties are very poor due to low rock maturity,strong compaction and cementation as well as weak dissolution.Reservoirs with different generation types have different properties.Delta-plain sandstones buried less than 2 200 m deep have the most effective reservoir properties.As depth increases,the properties fall rapidly.At the same depth,reservoir properties reduce from fan delta front and fan delta plain to shore-shallow lacustrine.

关 键 词：岩石学特征 物性特征 储集体类型 下白垩统 谭庄凹陷 周口坳陷 南华北盆地 

分 类 号：TE122.22[石油与天然气工程—油气勘探]