断层转折及其断层组合应力特征控油规律研究

Oil-controlling Rule Research of Fault Deflection and Fault Assemblage Stress Characteristic

受地震资料多解性和分辨率局限性的影响,依靠地震反射解释地下断层信息并不全面。鉴于此,对断裂转折和折射机理以及不同断裂组合型式应力集中状态做了系统研究。综合研究表明:断裂转折扩容控油,断裂转折处在剪切力作用下会形成规模性引张扩容空间,其与高孔高渗砂体的有利配置控制油气的主流向和富集程度;断裂切割深度突变的部位控油,断裂切割深度突变的位置是应力集中部位,一般也是断层面叠置的部位,张性裂缝通常发育,主断裂与其诱导的张性裂缝贯通联接构成油气优势运移通道和增大运移量;强应变区控油,油气往往富集于断裂脆塑性接触带或接触面构造应力叠复的强应变区,且油气富集强度与断裂面变形强度一般呈正相关。

Affected by the multi-resolution of seismic data and the limitation of resolution,the interpretation of underground fault information by means of seismic reflection is not comprehensive. In view of this problem,the author made a systematic study of the mechanism of fracture deflection and refraction as well as the stress concentration of different fracture types. The research results show that fault deflecting oil-gas control,when the fault deflecting under the action of shearing stress can form Scale wire expansion space,will make its favorable configuration with high-porosity and high-permeability in sand body controls of the main flow and the enrichment degree of oil and gas. The site of sudden change in fracture depth will control the oil-gas. Because the cut deep of mutation position is highly concentrated in position,it will generally get fault plane transition position. Tension crack is well developed,which shows the faults to induce tensile cracks penetrating in connecting oil-gas migration channel by increasing the amount of migration advantage. Strong strain zone oil-gas controlling and oil-gas will be often enriched into ductile-brittle fault in contacting zone. The tectonic stress of the contact surface is superimposed on the strong strain site. The enrichment strength of the ore body is generally positively correlated with the deformation strength of fracture surface.