沉积微相分析在胜南3、6区块滚动勘探中的应用

Sedimentary microfacies analysis in progressive exploration in Shengnan 3 and 6 blocks

在等时对比的基础上对胜南3、6区块中侏罗统三间房组Ⅰ油组进行了沉积相分析,在浅水辫状三角洲前缘亚相中识别出水下分流河道、席状砂(包括溢岸沉积)及浅湖等微相类型。以单井相分析成果为依据,结合测井相平面组合关系及砂体展布图,编制了各层沉积微相平面图。根据各微相砂体特征,提取主力砂体,以中期旋回为单位编制小层主力砂体的叠加图,确定优势储层分布区域,提交A、B、C、D等有利钻探位置。结合油气成藏条件分析,认为B、C井风险最小。

The sedimentary facies of Oil Unit I in Sanjianfang formation of Middle Jurassic in Shengnan 3 and 6 blocks have been analyzed based on isochronous correlation.In shallow braided delta front subfacies,some microfacies have been identified,such as underwater distributary channel,sheet sand(including overbank sedimentation) and shallow lake.Maps of sedimentary microfacies are presented for each layer according to single well facies analysis,logging facies relationship and sand distribution.Principle sands have been delineated and mapped as per medium base level cycle;regions of advantageous reservoirs are determined,favorable drilling locations of A,B,C and D are submitted,and B and C are considered to be least risky in conjunction with hydrocarbon accumulation analysis.