摘要
临兴气田位于鄂尔多斯盆地东部,已钻井揭示太2段具有良好的勘探开发前景。受沉积相控制,太原组为一套煤系地层,由于煤层与围岩阻抗差异大,会产生低频、连续、强振幅的反射,屏蔽砂岩的有效信号,严重干扰储层预测,同时本区砂岩与泥岩纵波阻抗叠置,利用常规波阻抗反演方法和地震属性难以预测。针对上述难点,首先通过正演模拟方法确定煤层影响范围,然后利用子波分解重构技术去除煤层影响,最后通过构建目标曲线,采用分频反演技术,完成了储层预测,优选了有利钻探目标,L-103井在太2段钻遇15.2m厚的气层,试气获得15.1×104 m3/d的无阻工业气流,取得了新突破,证实煤系地层储层预测技术准确,具有一定的借鉴和推广价值,对开辟鄂尔多斯盆地东部地区天然气勘探新局面具有重要的指导意义。
Linxing Gasfield,located in the eastern Ordos Basin,has a bright prospect in reservoir exploration and development on Tai2 Segment.Taiyuan Formation is characterized by coal-bearing strata controlled by sedimentary facies.The seismic reflection of the coal shows low-frequency,continuous and highamplitude to shields effective signal of sandstone disturbing reservoir prediction because of the different impedances between the coal and surrounding rocks.Conventional impedance inversion method and seismic attributes are hard to forecast gas reservoir in this area because of superimposed p-wave impedance of sandstone and mudstone.This article determines the influence of coal seams through the seismic forward modeling,removes the influence of coal seams using wavelet decomposition reconstruction technology,and then,builds the target curve using frequency division inversion technique to complete the reservoir prediction and optimize the drilling targets.Well L-103 yields 15.2 meters of gas-bearing formation and reaches the absolute open flow of gas production test 15.1×104 m3/d.It is proved that the reservoir prediction technology of coal measure strata is applicable to this area and has certain reference and promotion value.It also has great significance to the natural gas exploration in eastern Ordos Basin.
作者
齐宇
梁建设
柳迎红
陈思路
喻梓靓
蒋锐
Qi Yu;Liang Jianshe;Liu Yinghong;Chen Silu;Yu Ziliang;Jiang Rui(CNOOC Research Institute Ltd. , Beijing 100028, China)
出处
《地质科技情报》
CSCD
北大核心
2018年第1期252-257,共6页
Geological Science and Technology Information
基金
中海石油(中国)有限公司综合科研项目(YXKY-2017-ZY-10)
关键词
临兴气田
煤系地层
子波分解与重构
分频反演
煤系地层储层预测技术
Linxing Gasfield
coal measure strata
wavelet decomposition and reconstruction
frequencydivided inversion
reservoir prediction technique of coal measure strata
