P2井特殊烃组分气测异常显示层探讨

正常的油气显示层气测组分分布遵循一定的规律，而准噶尔盆地西北部的P2井在钻探过程中发现了不符合正常气测分布规律的气测异常显示层，由此引起多方关注与争议。在简述该井气测异常特点及特殊性基础上，对其产生原因进行了探讨，认为第一气测异常层无C1、C2值是由于该层原油为未成熟原油，裂解、降解不彻底所致，第二、第三显示层只有C1则是由于该层为稠油层，C1是微生物降解的结果。通过对相邻区块资料分析，进一步提出了以气测全烃曲线形态为主结合垒烃相对幅度与全烃饱满程度图板的气测异常显示解释评价方法，对于指导其他区块类似情况的研究具有参照作用。

Discussion on gas logging abnormal show zone with the special hydrocarbon components in P2 Well

Gas logging components distribution of normal oil and gas show zones follow certain rules, while gas logging abnormal show zones, which are not in accordance with normal gas logging distributing rules, were found during drilling P 2 Well in Zhunger northwest part, therefore leading to multi-party's attention and arguments. On the basis of briefly describing the gas logging abnormal features and particularity of the well, the author discussed its generating reasons and considered that no C_1 and C_2 values in first gas logging abnormal zone was due to that the oil in the zone was premature oil, pyrolysis and degradation were not thorough, C_1 in the second and third zones were heavy crude and the result of microorganism degradation in them. By analyzing the data of the adjacent blocks, the author set forth the gas abnormal show interpretation and evaluation method which regarded the total gas curve form of gas logging as main body combining with total gas relative magnitude and full degree chart, it had reference function to guide the study of similar condition of other areas.