松辽盆地南部英台断陷龙深1井深层层位归属

Discussion on the Ascription of the Deep Horizon of the Longshen 1 Well in the Yingtai Depression of Southern Songliao Basin

龙深1井是松辽盆地南部英台断陷深层天然气勘探的突破井,其深层层位归属问题是英台断陷资源评价和储量预测的关键。利用岩电特征、井间对比、孢粉化石组合分析、井震结合等综合确定了龙深1井的深层地层分层,认识如下:龙深1井营城组主要是由两套较厚的火山岩(火成岩)与两套较薄的沉积岩组成,与上下地层岩、电、震特征差别明显;龙深1井营城组孢粉化石特征与上下地层差异明显,裸子植物花粉体积分数为65%、蕨类植物孢子体积分数为35%,且可与松辽盆地北部营城组地层进行对比;龙深1井营城组的顶底界分别为2 895 m和3 532 m,沙河子组未钻穿。

The Longshen 1 well marks the breakthrough for deep gas exploration in the Yingtai depression in southern Songliao basin,and the ascription of its deep horizon is a key to the resource evaluation and reserve prediction in the Yingtai depression.The deep horizons in the Longshen 1 well were further subdivided by using rock-electric characteristics,correlation between wells,sporopollen assemblages and log and seismic data.The generalization is as the followings： the Yingcheng Group of the Longshen 1 well consisting of two set of thick volcanic（igneous rock） and two set of thin sedimentary rocks.They are significantly different from both the underlying and overlying layers in lithology,electrical property and seismic features.Its sporopollen characteristics were also distinct to those of the upper and lower formations,with gymnospermae pollen being up 65% and pteridophyta spore 35%,comparable to those of the Yingcheng Group in the northern Songliao basin.The top and bottom boundary of the Yingcheng Formation in the Longshen 1 well were 2 895 m and 3 532 m respectively and the Shahezi Formation has not been cut throught.