微地震事件密度在压裂评价中的应用——以准噶尔盆地玛湖凹陷为例

Application of microseismic event density in fracturing evaluation: taking Mahu Depression in Junggar Basin as an example

陈仙江 刘腾蛟 刘进军 王奎奎 徐刚 徐焕焕

中国石油新疆油田分公司开发公司，新疆 克拉玛依 834000 东方地球物理公司新兴物探开发处，河北 涿州 072751 四川页岩气勘探开发有限责任公司，四川 成都 610000

Development Company, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China New Resources Geophysical Exploration Division, BGP Inc., CNPC, Zhuozhou 072751, China Sichuan Shale Gas Exploration and Development Co., Ltd., Chengdu 610000, China

随着致密油、页岩油等非常规油气资源的规模开发，微地震监测技术在非常规储层改造中的应用发展十分迅速。现阶段的微地震监测解释技术主要利用微地震事件的位置、时间、震级、裂缝长宽高、储层改造体积等参数，结合压裂施工、地震地质等参数开展解释工作，无法有效评价缝网内部改造程度。微地震事件密度属性可以直观地反映缝网内部各位置的破碎程度，密度值越大，储层改造越充分，因此文中首次尝试开展微地震事件密度属性与事件距射孔距离参数交会分析，探索微地震事件密度分布特征。在统计准噶尔盆地玛湖凹陷百口泉组166段微地震事件密度分布特征后，形成了该区域密度分布模板，可用于评价单段改造效果与同区块平均改造效果差异，以及缝网内部改造程度。现场结合压裂施工曲线资料，可实时指导压裂施工规模优化，提高油井整体改造效果，同时结合玛湖凹陷某水平井产液剖面数据，证明微地震事件单段平均密度与各段产液量存在很好的相关性。

With the large-scale development of unconventional oil and gas resources such as tight oil and shale oil, the application of microseismic monitoring technology in the unconventional reservoir fracturing has developed rapidly. The current microseismic interpretation technology mainly uses the location, time, magnitude, fracture length, width and height, reservoir reconstruction volume and other parameters of microseismic events to carry out comprehensive analysis with fracturing construction and geological parameters, which cannot effectively evaluate the internal reconstruction degree of fracture network. The density attribute of microseismic events can intuitively reflect the degree of fragmentation of each position in the fracture network. The greater the density value, the more adequate the reservoir fracturing. Therefore, this paper first conducts the intersection analysis between the density attribute of microseismic events and the distance between the event and the perforation, exploring the distribution characteristics of the microseismic event density. After statistics of the density distribution characteristics of microseismic events in 166 stages of Baikouquan Formation in Mahu Depression of Junggar Basin, the density distribution template is established in this area, which can evaluate the difference between the single fracturing effect and the average fracturing effect in the same block, as well as the degree of fracturing inside the fracture network. Combined with the fracturing construction curve on site, it can guide the optimization of the fracturing scale in real time, and improve the overall fracturing effect. Meanwhile, combined with the liquid production profile data of a horizontal well in Mahu Depression, it is proved that the single average density of microseismic events is closely related to the liquid production of each section.

10.6056/dkyqt202303017