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坪北探区延长组为杏子川采油厂重要的油气接替区,综合利用钻井、测井、录井及分析化验等资料,选取李家畔页岩、张家滩页岩等作为地层对比标志层,采用旋回对比法,对坪北探区延长组地层进行对比及划分。将长8、长9两个油层组分别划分为长81、长82、长91、长92等亚组,同时确定了不同地层的界限。
The Yanchang Formation of Pingbei Exploration Area is an important oil and gas succession area of Xingzichuan Oil Production Plant. Based on the comprehensive utilization of drilling, well logging, well logging and laboratory analysis, the Lijiaban shale and Zhangjiathan shale are selected as the stratigraphic contrast markers , Using the method of cycle comparison, comparing and dividing the strata of Yanchang Formation in Pingbei Exploration Area. The two oil reservoirs, Chang 8 and Chang 9, are divided into subgroups of length 81, length 82, length 91, length 92 and so on, and the boundaries of different strata are also determined.