土库曼斯坦阿姆河右岸区块礁滩体地震地质综合识别方法

Integrated seismic and geologic studies of reef-beach body recognition technology in Amu Darya Right Bank,Turkmenistan

土库曼斯坦阿姆河盆地含气储层以碳酸盐岩礁滩体为主,由于其上部发育的巨厚膏盐地层对地震信号的屏蔽作用,导致阿姆河右岸区块礁滩体存在不易识别和难以预测的难题。通过开展地震地质综合识别技术研究,形成一套包含正演模型辅助解释、古地貌恢复和地层厚度识别、非连续性地震属性提取、波阻抗反演以及等时地层切片等技术的地震地质评价方法。综合多种方法的研究成果进行互相印证和补充,明确研究区膏盐层下部礁滩体圈闭的形成条件和空间展布特征。在此基础上,对阿姆河右岸区块礁滩体的发育特征与展布范围进行预测与评价。该研究成果有助于阿姆河右岸区块钻探目标的识别与优选,使得研究区探井、评价井成功率保持在90%以上。

Reef-beach limestone is the chief gas reservoir of Amu Darya Basin in Turkmenistan beneath the thick gypsum and salt formations. It is greatly difficult to identify and drill the reef. In order to solve the hard technical problems of reef recognition under salt in Amu Darya Right Bank gas field,several seismic and geological researches were carried out,including auxiliary interpretation of forward modeling,reconstruction of palaeo-geomorphology,discontinuous seismic multiattribute extraction,wave impedance inversion and isochronous stratigraphic slice,etc. A set of effective identification and geological evaluation techniques was established for reef beneath the salt. Conditions of trap formation and the spatial distribution characteristics of reef-beach traps beneath the gypsum were determined after research results of multi-methods were synthesized to be confirmed and supplemented by each other in the area. On that basis,the development characteristics and distribution of reef-beach in Amu Darya Right Bank Block were predicted and evaluated to help identify and optimize drilling targets. As a result,the success drilling rate of exploration wells and appraisal wells remained at more than90% in the area.