摘要
苏北盆地泰州低凸起早期的古潜山勘探未能获得实质性工业油气突破,中—古生界海相油气勘探前景不明。为此,在总结前人勘探实践和油气地质认识的基础上,以含油气系统理论为指导,运用晚期(二次)生烃、晚期动态成藏等研究方法,分析了该区油气勘探前景,筛选并初步评价了下一步勘探的有利区块,结论认为:①低凸起两侧生油凹陷具有较良好的陆相烃源供给条件;低凸起上残存有多套海相烃源层,具有现实的晚期(二次)生烃能力,可作为重要的油气源,其海相古生界泥页岩烃源岩尚具有形成页岩气藏的有利地质条件,三垛期末—盐城期是海相烃源和陆相油气源的主要运移、聚集及成藏期;②发育多套储集岩,储层物性参数相对较好,属于中—较好储层,可分出孔隙、裂隙、孔隙—裂隙复合型、溶蚀孔洞型等4种基本的储集类型;③以印支—晚燕山构造不整合面上下层位为储层可以构成3种生储盖组合,中燕山期以来的陆相区域沉积盖层构筑了晚期较良好的整体封闭保存条件,是油气运移、聚集的有利指向区,可形成陆相"新生古储"古潜山油气藏和晚期海相烃源岩二次生烃造就的"古生古储"、"古生新储"之重建型海相油气藏及页岩气藏,具有一定的油气勘探前景;④勘探思路上应油气并举,立体勘探,以寻找古潜山披覆型油气藏和古生界构造型油气藏为主,兼探页岩气藏;⑤选区评价认为北部古潜山构造带是最有利的勘探区带,可作为勘探突破首选目标区带。
Early exploration targeting at buried hills in the Taizhou low salient of the Subei Basin failed to obtain industrial oil/gas flow,obscuring the prospect of exploration of the Meso-Paleozoic marine sequences.Based on an overview of the previous exploration practices and geological understandings and under the guidance of petroleum system theories,the exploration potential of this study area is studied and some favorable plays are preliminarily identified by use of the methods such as late stage(secondary) hydrocarbon generation and late stage dynamic hydrocarbon pooling.The following conclusions were obtained.(1) The hydrocarbon kitchens on both sides of the low salient have fairly good non-marine source rocks and multiple residual marine source rocks occur on the low salient,indicating a relatively good potential of late-stage(secondary) hydrocarbon generation.In addition,the Paleozoic marine shaly source rocks are also favorable for the formation of shale gas plays.The Late Sanduo-Yancheng stages were the major periods for migration and accumulation of hydrocarbons from the Paleozoic marine and non-marine source rocks.(2) Multiple reservoir rocks with moderate-to-fair quality are recognized and divided into 4 basic reservoir types,including pore-type,fracture-type,composite pore-fracture type,and dissolution pore-vug type.(3) Three source-seal-reservoir rock combinations can be recognized by upper and lower reservoirs divided by the unconformity surface of Indosinian-Late Yanshan tectonic belts.The non-marine regional sedimentary cap rocks provide relatively good overall sealing conditions since the Middle Yanshan movement.Non-marine buried hill pools,marine pools resulted from secondary hydrocarbon generation of the late marine source rocks,and shale gas pools may occur,thus its exploration potential is quite good.(4) With the principle of 'stereoscopic exploration and simultaneous oil & gas development',buried hill drape-type reservoirs and the Paleozoic structural reservoirs should be taken as the primary exploration targets,while shale gas reservoirs as the secondary exploration targets.(5) From the evaluation of this study area,the northern buried hill structural zone is the most favorable for gas exploration as the next target in this study area.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2011年第10期42-46,117-118,共5页
Natural Gas Industry
关键词
苏北盆地
泰州低凸起
古潜山
成藏模式
晚期生烃
勘探前景
选区评价
目标区带
Subei Basin,Taizhou low salient,ancient buried hill,pooling pattern,late hydrocarbon generation,exploration potential,favorable play identification,target area
作者简介
作者简介：罗怀忠，1964年生，工程师，硕士；主要从事石油地质综合研究和勘探开发部署管理工作。地址：（224200）江苏省东台市纬二路31号浙江油山公司海安作业区。电话：13958134839。E—mail：luohz85@petrochina．com．cn
