CAJ | 학술논문

形成复杂网状裂缝沟通更大的储层体积是页岩储层改造的关键，但在微观上，页岩储层破裂面的特征影响自支撑裂缝的导流能力，破裂时在破裂面上产生的微裂缝影响页岩气的渗透性，这些对页岩储层的改造同样重要。利用四川盆地和济阳凹陷页岩岩样首先进行矿物组成和破裂实验后，利用3D激光扫描仪对一组岩样的破裂面进行扫描，分析破裂面的平整程度；利用扫描电子显微镜对两组岩样的破裂面进行不同倍比扫描，分析破裂面的微观形态特征。实验结果发现：方解石含量越高，破裂面等高线分布规律性越强，且越易在破裂面形成微裂缝；黏土含量越少，方解石和石英含量越高，越易发生剪切断裂。研究成果对认识页岩储层的破裂特征以及指导压裂方案设计具有一定的意义。
형성복잡망상렬봉구통경대적저층체적시혈암저층개조적관건，단재미관상，혈암저층파렬면적특정영향자지탱렬봉적도류능력，파렬시재파렬면상산생적미렬봉영향혈암기적삼투성，저사대혈암저층적개조동양중요。이용사천분지화제양요함혈암암양수선진행광물조성화파렬실험후，이용3D격광소묘의대일조암양적파렬면진행소묘，분석파렬면적평정정도；이용소묘전자현미경대량조암양적파렬면진행불동배비소묘，분석파렬면적미관형태특정。실험결과발현：방해석함량월고，파렬면등고선분포규률성월강，차월역재파렬면형성미렬봉；점토함량월소，방해석화석영함량월고，월역발생전절단렬。연구성과대인식혈암저층적파렬특정이급지도압렬방안설계구유일정적의의。
For shale reservoir reform it is critical to connect a larger reservoir volume by developing complex fracture network. Microscopically, however, the characteristics of fracture plane in shale reservoir affect the conductivity of self-propping fractures, and the microfractures formed on the fracture plane affect the permeability of shale gas. These aspects are equally important for shale res-ervoir stimulation. In this paper, the mineral composition and fracture test is conducted ifrstly for a series of shale samples taken from the Sichuan Basin and Jiyang Depression, and then a 3D laser scanner is used to scan the fracture planes in a group of samples, so as to analyze the lfatness of such planes. Next, a scanning electron microscope is used to scan the fracture planes in two groups of samples at different multipliers to analyze the microscopic characteristics of the fracture surfaces. The results show that, higher the calcite content, stronger the fracture planes’ regularity on the contour chart, and more easily the formation of microfractures in the fracture plane;shear fracture is more possible in case of lower clay content and higher content of quartz and calcite. These conclusions are signiifcance for understanding the fracture characteristics of shale reservoir and guiding the fracturing design.