页岩油气甜点识别的综合评价方法

发布时间：2018-04-25 12:21

本文选题：页岩油气 + 甜点　；参考：《中国矿业大学学报》2016年02期

【摘要】：页岩油气的高效开发需要最大程度地识别出甜点所在.为了将地质甜点与工程甜点有效融合来识别和评价页岩油气甜点,在总结龙马溪组勘探成功经验的基础上,以美国某盆地A组页岩层为例,提出"甜点体"的概念,其界定为体积压裂的对象.通过A组页岩储层纵向差异化研究,以及总有机碳(TOC)数值、脆性指数等地球物理预测方法的应用,结合甜点体非均质性变化对水平井产量影响的分析,建立了页岩油气甜点体的识别和综合评价方法,即五步法:垂向评级、平面划区、体积雕刻、差异压裂、油藏定调.研究结果表明:龙马溪组的TOC在2%~8%,含气量在1.7~4.8m~3/t,脆性矿物质量分数在20%~70%,"甜点"划分的门槛值应是TOC大于3%,含气量大于2m~3/t,脆性矿物质量分数大于40%.基于不同区域3个参数门槛值不同,该方法有利于区块内的勘探开发及钻完井技术适用性调整.
[Abstract]:The efficient exploitation of shale oil and gas requires maximum identification of desserts. In order to identify and evaluate shale oil and gas desserts effectively by combining geological desserts with engineering desserts, the concept of "desserts" is put forward on the basis of summing up the successful exploration experience of Longmaxi formation and taking the shale formations of group A in a basin of the United States as an example. It is defined as the object of volume fracturing. Based on the longitudinal differentiation of group A shale reservoir and the application of geophysical prediction methods such as total organic carbon TOC value and brittleness index, the effects of desserts heterogeneity on horizontal well production are analyzed. The method of recognition and comprehensive evaluation of shale oil and gas desserts is established, that is, vertical rating, plane zoning, volume carving, differential fracturing and reservoir tuning. The results show that the TOC of Longmaxi formation is 2 / 8, the gas content is 1.7 ~ 4.8mm / t, the mass fraction of brittle minerals is 20g / t, the threshold of "dessert" should be TOC > 3 / 10, gas content > 2 m / 3 / t, and the mass fraction of brittle minerals > 40 / t. Based on the different threshold values of three parameters in different regions, this method is beneficial to the exploration and development in blocks and the adjustment of the applicability of drilling and completion techniques.
【作者单位】：中海油研究总院;
【基金】：中国海油“十二五”重大专项课题(CNOOC-KJ125ZDXM21ZY)
【分类号】：TE37

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