%0 Journal Article %T 塔里木盆地塔河地区中下奥陶统鹰山组碳酸盐岩层系内幕不整合识别特征*<br>Identification methods and features of unconformity within carbonate successions of the Lower-Middle Ordovician Yingshan Formation in Tahe area,Tarim Basin %A 卫端 %A 高志前 %A 杨孝群 %A 孟苗苗 %A 陈跃 %A 董振坤 %A 王珊珊 %J 电子科技大学学报 %D 2017 %R 10.7605/gdlxb.2017.03.035 %X 为论证T<sup>6</sup><sub>7</sub>界面性质并探索碳酸盐岩层系不整合的识别方法,文章综合利用柯坪—巴楚地区露头和塔河地区钻井、测井和地震资料,研究了塔里木盆地塔河地区中下奥陶统鹰山组内幕不整合面T<sup>6</sup><sub>7</sub>。在露头上, T<sup>6</sup><sub>7</sub>界面表现为岩相转换面,但在不同剖面的暴露强度存在差异。在地化数据上, T<sup>6</sup><sub>7</sub>不整合面之下碳酸盐岩地层碳氧同位素值出现明显偏负;<em>Sc</em>,<em>Co</em>,<em>Ni</em>,<em>Ba</em>,<em>U</em>,<em>Sr</em>等微量元素表现出同样的特点,而<em>Li</em>和<em>V</em>在T<sup>6</sup><sub>7</sub>界面之下富集。在自然伽马测井与自然伽马能谱测井曲线上, T<sup>6</sup><sub>7</sub>不整合面之下的鹰山组下段自然伽马测井曲线明显较界面之上的鹰山组上段齿化剧烈,经过滤波处理的<em>Th/U</em>曲线在T<sup>6</sup><sub>7</sub>界面处呈现出明显的低值。在地震剖面上,难以从地震同相轴反射终止现象中识别出T<sup>6</sup><sub>7</sub>界面,但“串珠”状反射沿T<sup>6</sup><sub>7</sub>不整合面发育,这些串珠状反射被解释为与喀斯特作用相关的岩溶洞穴。T<sup>6</sup><sub>7</sub>界面属于海平面相对下降形成的短暂暴露面(<em><1</em>,<em>Ma</em>),其主要受控于海平面升降和古地貌,在塔河不同区域的暴露、剥蚀强度不同,强暴露区主要位于中东部,弱暴露区域主要位于西北部。T<sup>6</sup><sub>7</sub>不整合面对塔河地区鹰山组内幕碳酸盐岩储集层发育具有重要意义,既可为层间岩溶的发育提供条件,亦可与断裂构成连通体系为大气淡水提供通道,从而对塔河地区深部碳酸盐岩储集层起到积极的改造作用。<br>This paper integrates outcrops,well log and seismic data to describe the features of unconformity T<sup>6</sup><sub>7</sub> within the Yingshan Formation in Tahe area, Tarim Basin. The unconformity T<sup>6</sup><sub>7</sub> is characterized by lithofacies transitional surface at outcrops. <em>δ</em><sup>13</sup>C and <em>δ</em><sup>18</sup>O values below the unconformity T<sup>6</sup><sub>7</sub> are significantly more negative,the same as the trace elements of Sc,Co,Ni,Ba,U,and Sr. The contents of Li and V below the unconformity T<sup>6</sup><sub>7</sub> are relatively high. The GR logs in the lower part of the Yingshan Formation are more variable and have higher values. The Th/U values amended by filtering method are low at the section of unconformity T<sup>6</sup><sub>7</sub> . It is difficult to identify the unconformity T<sup>6</sup><sub>7</sub> based on the phenomena of reflection termination such as truncations,onlap and toplap in seismic profile,but some “beads-like” reflection anomalies are found along the unconformity T<sup>6</sup><sub>7</sub> %K 塔里木盆地 %K 塔河地区 %K 奥陶系 %K 鹰山组 %K 不整合面 %K < %K br> %U http://manu22.magtech.com.cn/gdlxb/CN/abstract/abstract9652.shtml