莺歌海盆地凹陷斜坡带成藏条件及勘探突破

发布时间：2018-08-14 09:20

【摘要】：莺歌海盆地凹陷斜坡带为斜坡带Ⅰ号断层下降盘与中央底辟带之间的过渡部位,是莺歌海盆地重要的成藏区带,但从70年代勘探至今仍无重大突破。该区勘探存在两大技术难题:1有利目标埋藏深度多达4000米左右,面临超高温、超高压的条件。2油气运聚条件一直被认为是该区带的薄弱环节。针对上述难题,本次研究从物源、坡折带类型、海平面升降、沉降中心迁移出发,明确大型优质储层发育的时空位置;通过屋脊断块的形成条件研究,首次明确凹陷斜坡南段(乐东段)具有强运聚条件。研究指出了莺歌海凹陷斜坡带南段具备大型优质储集体和强运聚能力,引领莺歌海凹陷斜坡带超高压领域岩性圈闭的勘探突破。
[Abstract]:The slope zone in Yinggehai basin is the transition between the No. 1 fault descending plate of slope belt and the central diapir zone. It is an important Tibetan forming zone in Yinggehai basin. However, there has been no significant breakthrough in exploration since the 1970s. There are two major technical difficulties in the exploration in this area. The burial depth of the favorable target at 1: 1 is about 4000 meters. The conditions of oil and gas migration and accumulation in the area are always considered to be weak links in the zone under the conditions of ultra-high temperature and ultra-high pressure. In view of the above problems, this study starts from the provenance, slope break type, sea level rise and fall, and the migration of subsidence center to determine the space-time location of the development of large and high-quality reservoirs; through the study of the forming conditions of roof fault blocks, For the first time, it is clear that the south section of the depression slope (Ledong section) has strong migration and accumulation conditions. It is pointed out that the south section of the slope belt in Yinggehai sag has large quality reservoir mass and strong migration and accumulation ability, which leads to the breakthrough of exploration of lithologic traps in the field of ultra-high pressure in the slope zone of Yinggehai sag.
【作者单位】：中海石油(中国)有限公司湛江分公司;
【分类号】：P618.13

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