姬塬油田长6油层组浊流和碎屑流的发现及意义  

The turbidity rocks and the debris flow’s discovery and significance of Jiyuan oilfield Chang 6 reservoir

作　　者：刘小宁[1] 杨小卫[1] 赵宏波[1] 

机构地区：[1]中国石油长庆油田分公司第五采油厂,陕西西安710021

出　　处：《石油化工应用》2013年第7期90-94,共5页Petrochemical Industry Application

摘　　要：通过对鄂尔多斯盆地姬塬油田长6油层组沉积序列、沉积构造、C-M图及测井曲线组合特征的研究,认为研究区除了存在如前人所说的三角洲前缘水下分流河道、河口坝、水下分流微相和浅湖亚相等沉积相外,长622和长632小层还存在浊流沉积和碎屑流沉积。浊积岩主要分布在坡折带上的三角洲前缘河口坝及以南的浅湖-半深湖区,碎屑流沉积主要分布在浅湖-半深湖区。坡折带坡度较陡,堆积了巨厚沉积,在地震诱发和重力作用下巨厚沉积物沿斜坡发生液化、移动和滑塌,形成浊积体。地震诱发大规模的波浪运动将正常浪基面附近的浊积岩体及湖相软泥搅动起来,以碎屑流形式被搬运至离岸较远的半深湖区形成碎屑流沉积。浊积岩砂体伸人湖盆腹地,下与长7烃源岩直接接触,并充分吸取烃源岩提供的油气,上有长4+5等上部泥岩封堵,具有良好的生、储、盖组合和形成较好油藏的条件,故加强对浊积岩的厚度、规模、含油性、开采方式等做更深层次的研究,是下一步对研究区浊积岩油藏的勘探方向。Based on the study of the sedimentary sequence, sedimentary structure, C-M map and log combination characteristics of a Jiyuan oilfield in the Erdos basin, we find that there not only exists the delta front subaqueous distributary channel, mouth bar, subaqueous distributary facies and shallow lake subfacies equal sedimentary facies in the Chang 6 oil-bearing that was sdudy by some geologist, but also exist turbidites and debris flow deposition in Chang 622 and Chang 632 layer. Turbidites are mainly distributed in delta front mouth bar on the slope break belt and shallow lake to half deep lake , debris flow deposits mainly distributed in the shallow lake and half deep lake , the slope break belt is steeper and the thick sedimentary was deposited there,gravity and earthquake lead to the thick sediments mobile and slump along the slope,and formed the turbidite. Wave motion induced by massive earthquake stirred up the turbidite rock near normal wave base and lacustrine mud in the lake, turbidite rock and lacustrine mud was transported to the offshore and debris flow deposition was formed.Turbidite sand body extends to the lake basin hinterland, the lower part of the sand body directly in contact with hydrocarbon source rocks of chang7, oil and gas came from hydrocarbon source rocks can be fully absorbed by sand.The upper part of the sand body directly in contact with the chang 4 ＋5 mud.Becouse there are good combination of source bed, reservoir ,cap rock and the formation of reservoir conditions,so it is the next direction of further exploration to study deeply the thickness, scale, oil and mining methods of the turbidite.

关 键 词：长6油层组 浊积岩 油藏 

分 类 号：TE122.2[石油与天然气工程—油气勘探]