苏北盆地浅层油气成藏特征与勘探前景

Characteristics and Exploration Prospect of Shallow Oil and Gas Accumulation in North Jiangsu Basin

苏北盆地浅层 (上第三系 )油气显示极为活跃 ,近年来 ,通过油气遥感、浅层地震、化探、钻井等综合勘探、研究 ,探讨了浅层油气的成藏特征和控制因素 ,评价出苏北盆地浅层油气勘探的 6个浅层含油气区带。其中 ,许庄、江都—吴堡地区和泰兴—海安地区属于有利区带 ,也是近期浅层油气勘探的主要试验勘探区带 ,提交苏北盆地第一口以寻找浅层油气为主的探井———XQ1井。 2 0 0 3年 3月 ,该井发生了江苏油田有史以来的强烈井喷。浅层油气的成藏 ,具有多来源的油气 ,储层物性好、盖层条件理想 ,为油气的成藏形成良好的储盖组合。气藏类型以岩性圈闭和低幅度构造圈闭为主 ,油气层埋藏深度一般为 5 0 0m～ 1 0 0 0m ,一般为 80 0m左右。初步预测苏北盆地浅层油气资源量可达 397 4 4× 1 0 8m3 ～ 1 4 1 8 5 5× 1 0 8m3 ,其中 ,江都—吴堡区带的资源量为 1 77 5 4× 1 0 8m3 ～ 5 0 3 0 4× 1 0 8m3 ;泰兴—海安区带的资源量为 1 30 6 0× 1 0 8m3 ～ 6 0 4 6 1× 1 0 8m3 。

The evidence of shallow oil and gas accumulation in Upper Tertiary are evident in the basin of north Jiangsu.The comprehensive methods of oil gas remote sensing,shallow earthquake,chemical exploration and drilling reveal the accumulation characteristics and controlling factors of shallow oil and gas reserves,evaluating six shallow oil gas bearing belts in the basin of north Jiangsu.Of which Xuzhuang,Jiangdu Wubao area and Taixing Haian area belong to a favorable oil gas forming belts and is the main trial exploration belt carried out for the shallow oil gas exploration in recent years.As a result,XQ1,the first exploration well is discovered in the basin of north Jiangsu during exploring the main sought shallow oil and gas accumulation.As a perfect combination both reservoir and capping bed for oil and gas accumulation,shallow oil and gas reserves are characteristic of multiple sources,perfect physical properties of reservoir and superficial conditions.The type of gas reservoir belongs to lithologic and low range structural traps.And buried depth of oil and gas accumulation is 500 m～1 0000 m,800 m in general.The preliminary estimation shows that resource amount of shallow oil and gas reservoirs are as much as 397 44×10 8m 3～1418 55×10 8 m 3 in the basin of north Jiangsu,in which Jiangdu Wubao area and Taixing Haian area are respectively 177 54×10 8m 3～503 04×10 8 m 3 and 130 60×10 8 m 3～604 61×10 8 m 3.