南阳地区泌阳凹陷沉积相展布与油气勘探

利用地震、测井、岩心资料,根据沉积构造、岩性剖面结构、砂体厚度确定了泌阳凹陷毕店地区古近系核桃园组三段沉积相类型;借助新的地震反演方法追踪三维数据体中的薄储层,在解释追踪基础上,得到核三段等时单砂层(或小层)厚度变化图,并编制了沉积相分布图。结果表明这里以广泛发育的浊积扇、滑塌扇等浊流沉积为特色,呈现出"南北部浊积扇夹中部深湖相"的沉积格局;早期富浊积砂、晚期富深水泥的沉积演化反映了湖平面的上升过程。基于有利的沉积相带,预测并评价了隐蔽圈闭,为油气勘探提供了依据。

Facies distribution and petroleum exploration in Biyang sag of Nanyang area

According to seismic,well-logging and core data,the micro-facies and type of the third Member of Paleogene Hetaoyuan Formation in Bidian area of Biyang sag were determined on the basis of sedimentary structures,lithological textures of profiles and thicknesses of sandstone bodies.Using the new methods for seismic inversion,the authors obtained the thickness of the iso-chronological single sandstone body and drew the distribution map of sedimentary micro-facies by tracing thin sandstone reservoirs from three-dimensional data.It is shown that there exist widely-distributed deposits of turbidite fans and sliding turbidite fans characterized by the turbidity-flows sediments,and sedimentary frameworks of north and south turbidite fans interbedded with the deep-water lacustrine sediments at the center.Sedimentary evolution,rich early turbidite sandstones and late deep-water mudstones suggest relative rise of the lacustrine level.In the light of favorable facies zones,the authors predicted and evaluated subtle traps of the sag,thus providing a basis for petroleum exploration.