【摘要】 针对红柳泉油田E13地层存在砂泥岩薄互层、厚层泥岩夹薄层砂岩两种薄砂层组合方式,在红118井、红17井测井资料和单砂层厚度、速度、密度及岩性纵向组合的约束下,本文设计了井间二维地质模型,采用正演技术,合成了40,60,80Hz三种频率的模型地震响应。根据研究区的薄层组合特征及模型正演结果,得出以下结论:①砂泥岩薄互层在40～80Hz地震响应中,主要出现强反射和弱反射两种响应特征,这主要取决于相邻反射界面地震波的干涉结果;②厚层泥岩夹薄层砂岩在40～80Hz地震响应中,反射特征逐渐由低频剖面中不连续复波演变为高频剖面中连续的强反射;③在地震响应中出现了层断波不断和波断层不断两种异常现象,前者可能由相邻砂体的子波旁瓣造成,后者可能是因砂体集中尖灭的累积效应所致;④对比60Hz地震响应和实际地震剖面可知,虽然在实际地震剖面上无法识别5m以下的单砂层,但却可以分析造成实际地震剖面上波形变化的地质原因,进而分析井间砂体是否存在、砂体厚度变化及砂体大致分布范围等细节。更多还原

【Abstract】 In E31 formation,Hongliuquan Oilfield,there are two sand sheet combinations:thin sand shale inter-beds,and thick mudstone clamping flagstone.Based on seismic velocity,thickness and density of single sand layer,lithological longitudinal combination,and well logging information from Well Hong 118and Well Hong 17,2D geologic model has been designed.With forward algorithm,three seismic response models with 40,60,80Hz are built.Based on sand sheet combination characteristics and the forward modeling,the following understandings are obtained:①In three seismic response models,strong and weak reflections appear on thin sand shale inter-beds,this is because of the interference from adjacent interfaces;②Reflections on thick mudstone clamping flagstone appears as complex waves on the 40Hz section,but as continuous strong events on the 80Hz section;③There are two abnormal phenomenon on the sections:continuous reflection on broken sheets and discontinuous reflection on continuous sheets.The former may be due to wavelet slide lobes of the adjacent sand bodies;the latter may be because of accumulation effects of sandstone concentrated pinch-outs;④Sand layers less than 5m cannot be identified on seismic sections,but geological reasons which cause waveform changes can be analyzed on seismic sections compared with the 60Hz response model.Therefore sand bodies cross wells,its thickness,and its distribution can be analyzed.更多还原