CAJ | 학술논문

天然气水合物(gas hydrates)作为一种新的潜在能源是目前世界范围内研究的热点和难点之一.目前普遍认为拟海底反射(简称BSR)是天然气水合物存在的重要标志之一,但有关水合物的识别仍有很多问题需要解决.例如世界各地已发现水合物的例证表明在没有BSR的情况下仍然存在水合物,在没有BSR的情况下如何识别水合物仍是没有解决的研究课题.本文以天然气水合物的识别为研究目的,以AVO属性交汇图为研究手段,通过双相介质正演理论模型研究了当地层含有天然气水合物或游离气时的AVO属性特征,并与由双相介质的交错网格有限差分法得到的合成地震记录所反演得出的AVO交汇图进行了对比,得到高度一致的对比结果,表明利用AVO属性交汇图是识别天然气水合物和游离气并能估测其含量的有效技术.
천연기수합물(gas hydrates)작위일충신적잠재능원시목전세계범위내연구적열점화난점지일.목전보편인위의해저반사(간칭BSR)시천연기수합물존재적중요표지지일,단유관수합물적식별잉유흔다문제수요해결.례여세계각지이발현수합물적예증표명재몰유BSR적정황하잉연존재수합물,재몰유BSR적정황하여하식별수합물잉시몰유해결적연구과제.본문이천연기수합물적식별위연구목적,이AVO속성교회도위연구수단,통과쌍상개질정연이론모형연구료당지층함유천연기수합물혹유리기시적AVO속성특정,병여유쌍상개질적교착망격유한차분법득도적합성지진기록소반연득출적AVO교회도진행료대비,득도고도일치적대비결과,표명이용AVO속성교회도시식별천연기수합물화유리기병능고측기함량적유효기술.
Gas hydrate is gradually considered as a potential energy resource. The presence of gas hydrate is commonly inferred from the appearance of "bottom simulating reflector"(BSR) on seismic section. Understanding the properties of hydrate-bearing sediments and studying the AVO characteristics of BSR are of great significance. Although more and more domestic and international studies have been conducted on the subjects mentioned above, they are still in the primary stage and need a long way to go to be appled in practice, especially in the field of gas hydrate. Aiming at the identification of gas hydrate, we studied the characteristics of the AVO attributes based on the Biot′s theory when the sediments were bearing gas hydrate or free gas. The AVO attribute crossplots obtained from seismic sections with the forward simulation by means of staggered-grid finite-difference were compared with that of theoretic models. The coincidence shows that utilization of AVO attribute crossplots is an effective way to recognize gas hydrate and free gas.