三维可视化技术在吉和油田开发中的应用

Application of 3-D visualization technique to Jihe oil field development.

二连盆地吉和油田位于马尼特坳陷阿南凹陷阿南斜坡带的吉和北鼻状构造 ,已探明含油区块 2个 :Ha76井断块和Ha78井断块 ,共上交石油地质储量 43 7× 10 4t,其中Ha76井断块已投入开发。油田储集层为中生界下白垩统巴彦花群腾格尔组腾一下粗段腾三油组。腾一段含油储集层 (细砂岩、砂砾岩等 )为浅—深湖相水下扇沉积 ,扇体形成于陡岸斜坡 ,物源主要来自苏尼特隆起。应用三维地震资料优选出过主要构造部位的 5口探井 ,利用声波测井数据 ,进行环境校正、极性调查、深度校正、选择合适的子波 ,制作出高精度的人工合成地震记录 ;分析对比区内地层纵向上的岩性组合规律 ,对油层组进行精确标定 ,并对油层顶面构造形态作出精细解释。在此基础上 ,应用三维可视化技术(地层可视化、构造可视化、振幅可视化 ) ,对解释成果进行沿层雕刻 ,认清了Ha78井、Ha81井处水下扇体中砂体展布的方向和范围 ;从主测线和联络线的可视化剖面图上显示出Ha78井、Ha81井向北油层增厚、反射增强的特点。说明该位置为扇体中部位 ,储集层渗透砂岩较厚 ,孔隙度较高 ,是有利油气聚集带 ,预测工作为吉和油田的进一步开发提供了井位部署依据。彩图

Jihe oil field in Erlian basin lies in north Jihe. Its oil reservoir is on a nose structure that is on Anan slope of Anan sag in Manite depression. Two blocks with oil have been found in the field:Well block Ha76 and Well block Ha78, whose OOIP are 43.7×10 5t totally. So far, the Well blo ck Ha76 has been developed. The reservoir beds are in the third Teng hydrocarbon layer, which is in Tengger Formation of Bayanhua Group formed in Lower Cretaceo us in Mesozoic. The reservoir beds consist of fine sandstone and sandy gravel, w hich are shallow deep lake submarine fan deposits. The fan sediments deposited on st eep slope, source area is the Sunite uplift in southeast. Five exploration wells are carefully selected with 3D seismic data , which are in the main structure. Synthetic seismograms are formed according to acoustic logs, with following reprocessing: environment correction, polarity ch eck, depth correction and selection wavelet, calibrating the reservoir beds base d on the analysis of strata lithologic association in the zone and interpreting the top structure of reservoir beds. The 3 D visualization technique (i.e. stra t a, structure and amplitude visualization) has been used, and the extension direc tion and boundary of sandstone at the Wells Ha78 and Ha81 have been clearly unde rstood. The visual sections of in line and cross line show that towards north the reservoir strata become thicker and reflections become stronger. These chara cters show that the Wells Ha78 and Ha81 are in the center of fan deposit, sand b ody is thick and porosity is high. It is a good hydrocarbon accumulation zone. T he well pattern has been decided for Jihe oil field further development.