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为了进一步探讨深水湖盆储层成因及油气勘探潜力问题,依据录井、测井、实验及试采等资料,对鄂尔多斯盆地西南部LM井区长7油层组深水浊积相的发育特征及其对储层发育的影响进行了研究.结果表明,LM井区长7油层组自上而下可划分为3个亚油层组和4个小层,下部长72亚油层组发育大套油页岩,中上部长72和长71亚油层组发育大套浊积岩和典型的鲍马序列,构成了一个完整的深水浊积层序,且可划分出浊积中扇、浊积下扇及深水盆地共3个亚相,以及浊积水道、水道间漫流、水道前缘漫流、浊积末梢、泥页岩及油页岩等6个沉积微相.该大型浊积扇体以浊积中扇为主体,且受西南单一物源及水系控制,砂体的连续性、连通性及复合性均较好,成为长7深水有效储层发育的主要成因类型;油气显示及产能良好,勘探开发潜力较大,是深水相区油气勘探开发的有效目标.“,”Aiming at the genesis of the deep-water reservoir in lacustrine basin and the potential of petroleum exploration,the deep-water turbidite characteristics and its influence on the reservoirs development of Chang 7 oil layers in LM well field in the southwestern Ordos Basin were studied according to logging,testing,experiments and producing test data,based on single well facies and logging facies analysis.The results show that Chang 7 oil layers can be divided into three sub oil layers and four sub-layers.Chang 73 sub oil layers in the lower Chang 7 developed a large set of oil shale,and Chang 72 and Chang 71 sub oil layers in the middle and upper Chang 7 developed a large set of turbidite and typical Bouma sequence,all of which constituted a complete deep-water turbidite facies sequence.The sedimentation can be sequentially divided into three subfacies including turbidite middle fan,turbidite lower fan and deep-water basin,as well as six microfacies types including turbidite channel,interchannel overflow,front channel overflow,turbidite endings,mud shale and oil shale.This large deep-water turbidite fan is dominated by turbidite middle fan and controlled by the southwest provenance and drainage system,with good sandbody continuity,connectivity and composition,and became the major genetic types for Chang 7 effective deep-water reservoir.With good oil show,and great exploration potential,the turbidite fan is an effective prospect for petroleum exploration on deep-water sediments.