倾角测井在沉积微相划分中的应用

Application of Dip Logging to Sedimentary Microfacies Division in Tazhong Area,Tarim Basin

利用地质构造图及岩心描述资料对塔中地区东河砂岩含砾砂岩亚段的倾角测井资料进行精细处理,确定出适合研究区的长相关和短相关处理参数。基于这两项参数,确立了平行层理、低角度斜层理、中角度斜层理、波状层理、爬升波纹层理、浪成交错层理、槽状交错层理及块状层理等8种层理类型的倾角响应模式。据此开展研究区单井沉积构造解释,并结合相关的沉积相背景研究,建立了滨岸相临滨滩、临滨凹槽、临滨坝、前滨坝、前滨凹槽及前滨滩等6种沉积微相的层理组合模式,最终精细划分沉积微相。这种方法充分发挥了倾角测井分辨率高的优势,提高了解释的精度,取得了较好的效果。

The dip logging data from the conglomeratic sand sub-section of Donghe sand member in Tazhong area of Tarim basin are pro- cessed in detail using geological structure diagram and core description information, and the parameters of long and short correlation pro- cessing for this area are presented. Based on the parameters, the eight dip logging response models for parallel bedding, low angle inclined bedding, middle angle inclined bedding, wave formed cross bedding, climbing-up bedding, wavy bedding, trough cross bedding, and mas- sive bedding are established, by which the sedimentary structure interpretation of single well in the studied area is conducted. Combined with related sedimentary facies setting, such six sedimentary microfacies bedding combination models as foreshore beach, foreshore groove, foreshore dam, near shore beach, near shore groove and near shore dam are identified in order to fine classify the sedimentary mierofacies. This method can make full use of the advantage of high-resolution of dip logging, increase the interpretation accuracy and obtain better re- sults.