潮汕坳陷地震资料的改善及中生界构造的新发现

潮汕坳陷是以中生界为目标的新的勘探领域 ,其地层时代、产状、岩性以及构造特征等都与珠江口盆地其它坳陷大相径庭 ,海水深度和目的层埋深也有很大差别 ,因此 ,该区地震资料的采集、处理和解释均有自己的特点。影响潮汕坳陷历年所采集的地震资料品质的主要因素有多次波、海底地形和礁体屏蔽、火成岩体干扰、不合理的采集参数以及不完善的资料处理手段等。近年来的地震资料采集中 ,使用合适的震源 ,采用合理的采集参数 ,避开恶劣的海况 ;在处理过程中 ,结合地质解释反复试验 ,选择正确的速度去除多次波 ,消除礁和火成岩体的干扰 ,提高了地震资料的信噪比和分辨率 ,从而使地震资料的品质得到很好的改善。在此基础上 ,结合区域地质研究结果 ,在潮汕坳陷总计发现了 4 4个大中型构造圈闭 ,并提供了一口探井井位

QUALITY IMPROVEMENT OF SEISMIC DATA AND NEWWT4HZ]IDENTIFICATION OF MESOZOIC PROSPECTSIDENTIFICATION OF MESOZOIC PROSPECTSIN CHAOSHAN DEPRESSION

As a new play where Mesozoic is the exploration target, Chaoshan depression is extremely different from other depressions in Pearl River Mouth basin in stratigraphic time, occurrence and lithological character, structural features, as well as water depth and exploration target depth. So this depression has its own characteristics in seismic acquisition, processing and interpretation. There are several factors that affect seismic data quality in the past years, such as multiple reflections, shielding of the sea floor and reef, disturbing of igneous rocks, unreasonable parameters of seismic acquisition and imperfect seismic processing. In recent years, we have made great progress in seismic data quality improvement by adopting suitable seismic sources and reasonable acquisition parameters, avoiding bad oceanic conditions in seismic acquisition, testing repeatedly in processing, selecting correct velocity in combination with geologic interpretation, eliminating disturbance of multiple reflections, reefs and igneous rocks, and improving signal_to_noise ratio and resolution. As a result, 44 middle_large structural prospects are identified and one wildcat location is proposed in Chaoshan depression in combination with the regional geologic knowledge.