大安沿江地区黑帝庙油层油气成藏模式研究

Study on the Rule of Hydrocarbon Accumulations of Heidimiao Reservoir in Daan Area along the River

大安沿江地区是近年吉林油田重要潜力区,其油气成藏模式的剖析是精细地质研究的基础,且对于指导油田开发区扩边、空白区布井及有利目标区预测具有重要意义。通过开展松辽盆地大安沿江地区黑帝庙油层烃源岩埋藏史、古构造演化史、油气运聚场和油水分布规律研究,揭示靶区油气成藏模式及控藏因素。研究结果表明:黑帝庙油层油气主要来自靶区北部的齐家～古龙凹陷嫩江组一段源岩。研究区黑帝庙油层顶面古构造演化主要经历4个阶段,油气成藏关键时期为明水组末期。通过对开发区单一圈闭控藏模式精细解剖,归纳出两种成藏模式:断鼻-岩性油气藏、砂岩上倾尖灭型岩性油藏,前者断层与砂体匹配形成有效油气圈闭,后者在无断层遮挡的情况下,油气聚集受砂体沉积展布的控制。

Daan area along the river is an important potential area for Jilin oilfield, the analyze for its hydrocar- bon accumulation model, which has great significance to leading oilfield development areas to expand side, arranging wells for blank area and predicting favorable areas, is the base of fine geological research. The buried history of the source rocks, the palaeotectonic evolution history, the migration and accumulation field of hydrocarbon, the reser- voir sedimentary characteristics and the oil-water distribution rule in the Heidimiao reservoir in Daan area along the river are comprehensively analyzed. The result showed that： the hydrocarbon of the heidimiao reservoir was mainly derived from the underlying source rocks of the I segment of the Nenjiang Group, the key stage of hydrocarbon accu- mulation was at the end of the Mingshui Group. The heidimiao reservoir top has four stages of palaeotectonie evolu- tion. Through the anatomy of the single trap on dense well development areas on reservoir model, it can be summed in two hydrocarbon accumulation models ： fault-nose strueture-lithologic reservoir and lithologie reservoir, for the for- mer, the faults matching the sand formed an effective hydrocarbon traps ; in the condition of no faults sealed, for the latter, the hydrocarbon accumulation is mainly affected by the reservoir sand distribution.