CAJ | 학술논문

致密砂岩储层渗透率小于10×10-3μm2,由于其储集空间类型及特征的特殊性,在油气成藏机理方面与常规油气藏存在根本的区别.该文从分析“根缘气”的形成条件及成藏特点出发,以模拟实验为基础,根据济阳坳陷致密储层特点,探讨油气成藏机理:致密储层油气运移成藏以超压充注为主,超压传递到达的边界就是其含油(气)边界,超压梯度大,油气充注的距离和圈闭滞留的范围就大,含烃饱和度也相对高.通过成藏相似性研究认为,济阳坳陷致密砂岩油气藏具以下特点:①烃源岩持续供烃,源内及附近储层蕴含着大量的分异性较差的油气;②致密砂岩储层“相势控藏”;③具有大面积分布致密油气藏的条件,勘探潜力大.
치밀사암저층삼투솔소우10×10-3μm2,유우기저집공간류형급특정적특수성,재유기성장궤리방면여상규유기장존재근본적구별.해문종분석“근연기”적형성조건급성장특점출발,이모의실험위기출,근거제양요함치밀저층특점,탐토유기성장궤리:치밀저층유기운이성장이초압충주위주,초압전체도체적변계취시기함유(기)변계,초압제도대,유기충주적거리화권폐체류적범위취대,함경포화도야상대고.통과성장상사성연구인위,제양요함치밀사암유기장구이하특점:①경원암지속공경,원내급부근저층온함착대량적분이성교차적유기;②치밀사암저층“상세공장”;③구유대면적분포치밀유기장적조건,감탐잠력대.
The permeability of tight sandstone reservoirs is below 10×10-3 μm2 . Due to the particularity of reser-voir space type and characteristics, the tight sandstone reservoirs are different from normal ones in hydrocarbon accumulation mechanism. The generation conditions and accumulation features of “ source-contacting gas” are studied. Based on simulation experiments, hydrocarbon accumulation mechanism is concluded according to the features of tight sandstone reservoirs in the Jiyang Depression. Overpressure charging is the main way of hydro-carbon migration and accumulation in tight sandstone reservoir. The border for overpressure transfer is the bound-ary for oil or gas. When overpressure gradient is larger, the distance of hydrocarbon charging and the range of trap will be larger, and the hydrocarbon saturation will be higher. Through similarity research, the tight sand-stone reservoirs in the Jiyang Depression have the following characteristics. 1) Source rocks contribute to hydro-carbon continuously. Large quantity of oil and gas with poor diversity exist in source rocks or neighboring reser-voirs. 2) In tight sandstone reservoirs, facies and potential control accumulation. 3) Tight reservoirs may exist widely, indicating for good exploration potential.