【摘要】：四川長寧-威遠頁巖氣示范區(qū)套管變形問題突出,天然裂縫或斷層是導(dǎo)致套管變形的主要因素。為了明確引起套管變形的裂縫或斷層尺度與微地震震級之間的關(guān)系,分析了圓形斷層模型的震源參數(shù)關(guān)系,建立了由斷層半徑、滑移距離、地震矩和矩震級等參數(shù)組成的數(shù)學(xué)模型。首先根據(jù)24臂井徑測井?dāng)?shù)據(jù)或通過套管變形點的磨鞋最大直徑來確定斷層的滑動量(即套管變形量),然后利用該模型計算得到引起套管變形的裂縫或斷層的半徑和微地震震級。計算結(jié)果表明,引起長寧-威遠區(qū)塊套管變形的裂縫或斷層的半徑為100~400m,微地震距震級為2.0~3.5,這與現(xiàn)場實測數(shù)據(jù)吻合,表明該模型在長寧-威遠區(qū)塊具有一定的可靠性和實用性,也驗證了套管變形機理的正確性。研究結(jié)果對于井眼軌道優(yōu)化設(shè)計、壓裂過程中的實時微地震監(jiān)測與套管變形預(yù)防及治理具有一定的指導(dǎo)作用。
[Abstract]:The casing deformation problem is prominent in Changning-Weiyuan shale gas demonstration area of Sichuan Province, and natural cracks or faults are the main factors leading to casing deformation. In order to clarify the relationship between the fracture or fault scale causing casing deformation and the magnitude of microearthquakes, the relationship between focal parameters of circular fault model is analyzed, and the fault radius and slip distance are established. A mathematical model composed of parameters such as seismic moment and moment magnitude. First of all, the slip amount of the fault (that is, casing deformation) is determined according to the 24-arm well diameter logging data or through the maximum diameter of the casing deformation point. Then the radius of cracks or faults causing casing deformation and the magnitude of microearthquakes are calculated by using the model. The calculation results show that the radius of cracks or faults causing casing deformation in Changning-Weiyuan block is 100 鈮，

本文編號：2488403