江汉盆地西南缘隐蔽圈闭形成特征及油气勘探意义  

Features of Subtle-trap Formation and Implication for Hydrocarbon Exploration in South-west of Jianghan Basin

作　　者：刘中戎[1] 王雪玲[2] 

机构地区：[1]中国石油化工股份有限公司勘探南方分公司外围工作部,四川成都610041 [2]中国石油化工股份有限公司勘探南方分公司研究院,四川成都610041

出　　处：《石油天然气学报》2009年第4期176-179,共4页Journal of Oil and Gas Technology

摘　　要：从江汉盆地西南缘目前主要勘探目的层系的沉积环境及沉积相来看:白垩系渔洋组三、四段砂岩储层主要为三角洲平原沉积环境下的分支河道沉积砂体;新沟咀组下段Ⅲ油组的砂岩储层主要为缓坡背景下的三角洲沉积体系,以水下扇沉积砂体为主。导致了油藏的含油气性在纵向、横向上变化大,预测岩性圈闭较发育,隐蔽岩性油藏将成为研究区今后主要的勘探方向和目标。研究区隐蔽圈闭的形成主要受控于构造演化和沉积特征,在这两种控制因素的作用下,目前发现了3种类型的隐蔽圈闭,分别为构造-岩性圈闭、地层不整合圈闭和岩性圈闭。从区域构造背景来看,这些圈闭地处于油气运聚的有利指向区,在相应的圈闭上相继部署了多口勘探井(Es11-1井、Es6-C井、Es6-1井、Es4-1井),在白垩系渔洋组、新沟下段Ⅲ油组和新领域沙市组盐下等层序中获得高产的工业油流,取得了较好的经济效益。The sedimentary environments and sedimentary facies of main strata were considered for present exploration in south-western edge in Jianghan Basin,it was concluded that the sandstone reservoirs of the 3rd and 4th members of Yuhan Formation of Cretaceous were the sedimentary sandstones by the river branches in the sedimentary environment of delta plain,the sandstone reservoirs of Ⅲ pay zone of the lower member of Xingouzui Formation belonged to delta sedimentary system under the background of gentle slope,which was dominated by underwater fan sedimentary sandstones,by which the great oil-bearing changes of reservoirs were induced in longitudinal and transversal directions and well developed lithological traps,therefore the subtle litholigical reservoirs were the main exploration directions and target in future.According to the analyses,the formation of the subtle traps in this area is controlled by two factors mainly:structure evolution and the sedimentary features.Under the controlling of this two factors,there are three kinds of traps are found at present,they are structural lithological trap,stratigraphic unconformity trap and lithological trap.Based on the regional structure,the traps are distributed in the favorable areas for oil and gas migration and accumulation and many exploration wells are planed in these traps (Well ES11-1,ES6-C,ES6-1,ES4-1).Commercial oil fluid with high production are obtained in the strata such as Yuyang Formation,Ⅲ pay zone of lower member of Xingouzui Formation and a new field infra-saltbody stratum of Shashi Formation,thus good economic efficiency is obtained.

关 键 词：江汉盆地西南缘 沉积相 含油气性 岩性圈闭类型 岩性油藏 

分 类 号：P618.13[天文地球—矿床学]