“层位控制法”速度场在巨厚盐丘覆盖区的应用  

Application of “horizon-controlling” velocity field in significant thickness of salt-dome-covered area

作　　者：张延庆[1] 吴清龙 金玉洁[3] 王霞 刘文利 高军 

机构地区：[1]中国地质大学能源系 [2]东方地球物理公司研究院地质研究中心 [3]中国矿业大学理学院

出　　处：《石油地球物理勘探》2007年第2期212-215,共4页Oil Geophysical Prospecting

摘　　要：肯基亚克盐下石炭系具有良好的油气勘探、开发前景。钻探及研究成果表明石炭系油气分布在很大程度上受控于构造。由于该区石炭系目的层埋深大(超过3500m),特别是上覆二叠系巨厚盐丘造成速度横向、纵向剧烈变化,从而导致石炭系构造畸变。采用以往的速度研究方法编制的构造图与实际钻探深度差异较大,造成钻探结果与构造图经常出现不符合现象,难以满足精细构造解释的需要。本文从地震资料研究入手,通过对盐丘非纯岩盐段反射能量与盐丘层速度统计分析,得到了非纯岩盐段反射能量与层速度的统计关系,应用“层位控制法”的速度建场方法建立速度场。用此方法编制的构造图消除了盐丘对下伏构造的影响,与随后钻井数据的吻合程度较高,为下一步勘探、开发提供了可靠的基础资料。Good prospect of hydrocarbon exploration and development in Kenjiyak sub-salt Carboniferous, the drilling and study results showed that the Carboniferous hydrocarbon distribution is controlled by structure to a considerable degree. Since the deep depth of Carboniferous targets in the region (deeper than 3500m),especially the rapidly changed velocity in both lateral and vertical direction resulted from significant thickness of overlying Permian salt dome leads to imaging distortion of Carboniferous structures.It makes great difference between the structural map drawn by using former velocity study method and practical drilling depth, inconsistent between the drilled results and structural map and hard to meet the needs of fine structural interpretation.Starting from studying seismic data, the paper analyzed statistically the reflection energy of non-pure rock salt segment in salt dome and velocities of salt dome,yielding statistic relationship between reflection and velocity of non-pure rock salt segment and building up velocity field by “horizon-controlling” velocity-field-built-up method. Using the approach for drawing structural map eliminates the influence of sub-salt on overlying structures,which has good coincidence with following drilling data and provides reliable basic data for next exploration and development.

关 键 词：层速度 盐丘 精细构造解释 反射能量 速度变化 交会图 

分 类 号：P227[天文地球—大地测量学与测量工程]