浅议塔河地区“东河砂岩”三角洲沉积  

Analysis on Delta Sediment of Donghe Sandstone in Tahe Area

作　　者：钟红利[1,2,3] 蒲仁海[1,2] 闫华 赵明[4] 付彩利[5] 

机构地区：[1]西北大学地质学系,西安710069 [2]西北大学大陆动力学国家重点实验室,西安710069 [3]西安科技大学,西安710054 [4]中国石油化工股份有限公司西北油田分公司,乌鲁木齐830011 [5]中国石油天然气集团公司长庆油田钻井工程技术研究院,西安710021

出　　处：《地质科技情报》2011年第4期37-42,共6页Geological Science and Technology Information

基　　金：国家重大专项课题(2008ZX05001-003);中国石油化工股份有限公司前瞻性项目(YPH08114)

摘　　要：近年来在塔河地区钻揭了一套典型的河控三角洲相"东河砂岩",它与东河塘、塔中和哈得逊等地区发现的前滨相和滨面相"东河砂岩"明显不同。钻井岩心上该套三角洲相砂岩表现为板状交错层理、平行层理厚砂体;粒度概率具有河道、河口坝微相特征;平面上地震振幅、反射强度斜率属性异常呈以S99、T728井为中心的"鸟足状"外形;古盐度测试结果反映在三角洲河口附近的S109、T727井为半咸水沉积。综合钻井、测井、地震、地球化学等资料的分析,塔河地区"东河砂岩"除发育滨海沉积外,同时还发育三角洲前缘分流河道、河口坝沉积,该区"东河砂岩"为河控型朵状三角洲—滨海沉积体系。In recent years typical river controlled delta sediments have been discovered by drilling in Tahe area. They obviously differ from Donghe sandstone found in Donghetang area, Tazhong area and Hade area, which are offshore and shore facies deposition. This formation has thick sandbody with tabular crossbedding and parallel bedding. The grain size probability curves show the features of tributary channel and mouth bar sediments. Both the RMS amplitude map and the reflection strength slope map of the top of Donghe sandstone formation display bird foot shape abnormal attribute area whose center involves well $99, well T728. The paleosalinity data indicate that the paleosalinity of well S109 and well T727 near paleo delta estuary is semi-saline. The synthetic analyses of drilling cores, log curve, seismic data and geochemistry data suggest that Donghe sandstone in Tahe area has tributary channel and mouth bar sediments besides the littoral sediments. Hence, Donghe sandstone is a river controlled and littoral deposit.

关 键 词：“东河砂岩” 沉积环境 地震属性 古盐度 “鸟足状”三角洲 

分 类 号：P588.21[天文地球—岩石学]