镇泾地区长8段致密低渗透油藏主控因素分析  

MAIN CONTROLLING FACTORS ANALYSIS OF LOW PERMEABLE TIGHT RESERVOIRS OF CHANG 8 FORMATION IN ZHENJING AREA

作　　者：丁晓琪[1] 张哨楠[1] 谢世文[1] 易超[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.成都理工大学,四川成都610059

出　　处：《西南石油大学学报（自然科学版）》2011年第1期25-30,9,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学青年基金项目(40602012)

摘　　要：鄂尔多斯盆地西南缘镇泾地区长8油藏具有渗透率低、丰度低、储量大的特点,已钻遇的多口高产井显示出长8良好的油气勘探潜力。通过沉积微层、层序、裂缝及湖盆底形分析,认为长81中期基准面上升半旋回中部的坝顶席状砂为高效储层发育段;与基底断裂有关的裂缝极大地改善了低渗透储层的渗流能力;长8湖盆底形的起伏控制着早白垩世晚期铁方解石的胶结作用,底形的高点是铁方解石弱胶结区,储层物性相对较好,为甜点发育区。通过主控因素分析,提出长8致密低渗透油藏勘探思路及工作方法,即"定层序、占高点、追裂缝、打河道"。Chang 8 Formation,Zhenjing area of southwest Ordos Basin is of low permeability,low abundance and rich reserves.Favorable petroleum exploration potential was displayed by many wells with high production which have been drilled in recent years.High qualities reservoirs are sheet sandstones bar in ascend hemicycle of middle period basal level cycles,and fractures with foundational faults can improve permeability of reservoirs extremely,and trend of fractures are northeast.Ferrocalcite cement of late lower cretaceous are controlled by fluctuations of lake floor shape,and weak ferrocalcite cement sandstone are distributed in ups of lake floor shape,and reservoir has fine physical property.Exploration idea and operating procedure of low permeable tight reservoirs of Chang 8 Formation are clarification on the sequence strata and high spots,tracking fractures and sedimentary facies.

关 键 词：鄂尔多斯盆地 镇泾地区 长8段 低渗透 成藏规律 

分 类 号：TE122.1[石油与天然气工程—油气勘探]