海相砂体准层序对油气分布的控制作用——以塔北哈拉哈塘地区东河砂岩为例  

CONTROL OF MARINE SANDBODY PARASEQUENCE ON OIL-GAS DISTRIBUTION:A CASE STUDY OF THE DONGHE SANDSTONE IN HALAHATANG AREA OF THE NORTHERN TARIM BASIN,CHINA

作　　者：贾进华[1] 申银民[2] JIA Jin Hua;SHEN Yin Min(Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083;Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田公司勘探开发研究院,新疆库尔勒841000

出　　处：《地层学杂志》2023年第2期132-143,共12页Journal of Stratigraphy

基　　金：国家油气重大专项(2016ZX05046-001)资助。

摘　　要：为进一步阐明海相砂岩的油气分布规律,本文针对塔里木盆地哈拉哈塘地区石炭系角砾岩段和东河砂岩段,利用已钻井岩芯、测井、油气显示等资料,在沉积相研究的基础上,开展了以准层序为单元的高精度小层砂体划分与对比,解释了准层序小层砂体分布与不同层位油气显示的控制关系。东河砂岩段是一套以前滨-临滨亚相为主的滨岸海滩相石英砂岩沉积,储层物性较好,孔隙度为11%~20%,可以作为油气运移的输导层。受内部泥质夹层、小层砂体结构及古构造的影响,油气在不同层位显示与聚集。研究表明,该区东河砂岩段自下而上可划分为3个准层序组或亚段,下准层序组为灰色细砂岩、粉砂岩夹少量红褐色薄层泥岩,砂体呈加积型;中准层序组为浅灰色厚层中细纯砂岩,几乎不含泥岩夹层,砂体呈进积型;上准层序组为浅灰色细砂岩和钙质粉砂岩夹少量红褐色薄层泥岩,砂体呈退积型。上准层序组从下到上可再细分为4个准层序小层,下部砂多泥少,向上砂体厚度减薄,薄层泥岩微加厚,或表现为钙质砂岩与非钙质砂岩互层。东河砂岩段油气显示主要在上准层序组砂体,从北向南不同井的油气显示位置和显示程度不同。北部井的油气显示主要位于上准层序组砂体的中下部,向南油气显示层位逐步抬高,位于东河砂岩段顶部,直至在角砾岩段显示。东河砂岩段顶部的油层分布表明油气具有由北向南运移的特征。晚喜山期,受后期构造反转调整,油气以东河砂岩段上部的准层序小层砂体为输导层,自北向南长距离侧向运移,受内部泥质隔夹层控制,形成多层位含油、局部富集的岩性油藏。In order to further clarify the oil-gas distribution of marine sandbody,it is aimed at Carboniferous Breccia Member and the Donghe sandstone Member in Halahatang area of the Tarim Basin.Based on the data of drilled cores,well logging,oil-gas displays,and based on sedimentary facies research,it is carried out the high-precision parasequence division and correlation.The control relationship between the sublayers and the oil-gas displays of different layers is explained.The Donghe sandstone Member is a set of quartz sandstone with foreshore and shoreface subfacies.The reservoir is of high quality physical properties with a porosity of 11%-20%that can be used as a carrier bed for oil-gas migration.Influenced by the internal argillaceous intercalation,sublayer sandbody architecture and paleostructure,oil-gas shows accumulate in different layers.The Donghe sandstone Member can be divided into three parasequence sets or submember in this area.The lower parasequence sets is aggregative with gray fine sandstones,siltstones and a small amount of red-brown thin mudstones.The middle parasequence sets is characterized by progradation.The lithology is light-gray thick medium-fine sandstones and less mudstone interlayers.The upper parasequence sets is regressive,composed of light-gray fine sandstones and calcareous siltstones sandwiched by a small amount of red-brown thin mudstones.The upper parasequence sets can be subdivided into four parasequence layers vertically upward.There is more sand and less mud in the lower part,and the thickness of the upward sandbody is reduced.The thin layer of mudstone is slightly thickened,or manifested as the interbedded between calcareous sandstone layers and non-calcareous sandstone layers.The oil-gas display in the Donghe sandstone Member is mainly in the upper parasequence sets sandbody,with different oil-gas display positions and degrees from north to south in different wells.The oil-gas display in the northern well is mainly located in the middle and the lower part of the upper parasequen

关 键 词：准层序 油气分布 东河砂岩 哈拉哈塘地区 塔北 

分 类 号：P534.45[天文地球—古生物学与地层学]