基于波幅定量化的潜山储层有效性评价

Effectiveness evaluation of buried hill reservoirs based on acoustic amplitude quantification

目前主要在常规资料评价的基础上,依靠核磁共振、微电阻率扫描成像、超声波井壁成像及阵列声波解释评价潜山储层的有效性。上述测井技术在储层有效性精细评价方面展现了较好应用效果,同时也存在不足之处。此外,由于影响储层有效性的因素较多,如裂缝密度、裂缝倾角等,虽然能依据电成像资料准确描述裂缝产状,但难以准确评价潜山储层的有效性。为此,深入挖潜了现有测井资料的应用价值,通过创新应用声波幅度(波幅)资料,将主要应用于固井质量评价的波幅参数引入潜山储层有效性评价,拓展了声波资料的应用广度;针对波幅资料无法定量应用的问题,创建了波幅比值法定量表征波幅,定量评价了单井储层有效性及定量对比了多井之间储层的有效性差异;构建了波幅产能指数,并结合波幅比建立了潜山储层有效性评价图板,提升了储层有效性评价精度,可快速预判储层产能。所提方法为评价潜山储层的有效性提供了新思路。

The effectiveness of buried hill reservoirs is evaluated and interpreted mainly based on conventional data evaluation,and nuclear magnetic resonance,micro resistivity scanning imaging,ultrasonic borehole wall imaging,and array acoustic waves are usually utilized.The above logging technologies have shown positive application effects in the fine evaluation of reservoir effectiveness,but they also have shortcomings.In addition,there are many factors affecting the effectiveness of fractures,such as fracture density,fracture dip,etc.As a result,although the fracture occurrence can be accurately described based on electrical imaging data,it is difficult to accurately evaluate the effectiveness of buried hill reservoirs.Therefore,the application value of existing logging data is deeply explored.Through the innovative application of acoustic amplitude(hereinafter referred to as amplitude)data,the amplitude parameters mainly used for cementing quality evaluation are introduced into the effectiveness evaluation of buried hill reservoirs,which expands the application scope of acoustic data.In order to solve the problem that the amplitude data cannot be used quantitatively,an amplitude ratio method is created to quantitatively characterize the amplitude,and the effectiveness of the single-well reservoir is quantitatively evalua-ted.Furthermore,the effectiveness differences among multiple-well reservoirs are quantitatively compared.The amplitude productivity index is constructed,and an effectiveness evaluation chart for buried hill reservoirs is established according to the amplitude ratio,which improves the accuracy of reservoir effectiveness evaluation and quickly predicts reservoir productivity.The proposed method provides a new idea for evaluating the effectiveness of buried hill reservoirs.