石油与天然气地质
石油與天然氣地質
석유여천연기지질
Oil & Gas Geology
2015年
5期
788-792
,共5页
控制因素%有效储层%深层系%高邮凹陷
控製因素%有效儲層%深層繫%高郵凹陷
공제인소%유효저층%심층계%고유요함
Control factors%deep series of effective reservoir formation%Gaoyou sag
高邮凹陷发育上、中、下三套含油气系统，深层系油藏属于下含油气系统。通过对深层系成藏基本特征、有效储层发育的关键控制因素研究，取得系统认识。下含油气系统成藏条件表现为“上生下储”特点，即上部阜二段生成的油气，在异常高压条件下下排进入阜一段储层。阜一段储层主要为三角洲前缘亚相沉积，砂体发育，但整体表现为低孔低渗特点。研究认为，沉积微相、埋深与成岩、异常高压与油气充注三者控制了深层有效储层的发育：水下分支分流河道和河口坝是有效储层发育的有利微相；储层处于晚成岩A1期，次生孔隙发育改善了储集条件；深层系存在异常高压层有利于油气充注，油气充注时间早于砂岩致密化时间，有利于储集空间保存。其中，有利的沉积微相和发育次生孔隙带，是决定深层发育有效储层的主要因素。
高郵凹陷髮育上、中、下三套含油氣繫統，深層繫油藏屬于下含油氣繫統。通過對深層繫成藏基本特徵、有效儲層髮育的關鍵控製因素研究，取得繫統認識。下含油氣繫統成藏條件錶現為“上生下儲”特點，即上部阜二段生成的油氣，在異常高壓條件下下排進入阜一段儲層。阜一段儲層主要為三角洲前緣亞相沉積，砂體髮育，但整體錶現為低孔低滲特點。研究認為，沉積微相、埋深與成巖、異常高壓與油氣充註三者控製瞭深層有效儲層的髮育：水下分支分流河道和河口壩是有效儲層髮育的有利微相；儲層處于晚成巖A1期，次生孔隙髮育改善瞭儲集條件；深層繫存在異常高壓層有利于油氣充註，油氣充註時間早于砂巖緻密化時間，有利于儲集空間保存。其中，有利的沉積微相和髮育次生孔隙帶，是決定深層髮育有效儲層的主要因素。
고유요함발육상、중、하삼투함유기계통，심층계유장속우하함유기계통。통과대심층계성장기본특정、유효저층발육적관건공제인소연구，취득계통인식。하함유기계통성장조건표현위“상생하저”특점，즉상부부이단생성적유기，재이상고압조건하하배진입부일단저층。부일단저층주요위삼각주전연아상침적，사체발육，단정체표현위저공저삼특점。연구인위，침적미상、매심여성암、이상고압여유기충주삼자공제료심층유효저층적발육：수하분지분류하도화하구패시유효저층발육적유리미상；저층처우만성암A1기，차생공극발육개선료저집조건；심층계존재이상고압층유리우유기충주，유기충주시간조우사암치밀화시간，유리우저집공간보존。기중，유리적침적미상화발육차생공극대，시결정심층발육유효저층적주요인소。
Gaoyou depression in Subei basin consists of three sets of petroleum systems ,including higher ,middle and low er .Deep system belongs to low er petroleum system .Based on the research of the basic characteristics and the key control factors of reservoir development ,the system conclusion has been recognized .The Lower petroleum sys‐tem of reservoir’s forming conditions performs as“Injection Migration”characteristics .That is ,the upper E1 f 2 sec‐tions of produced oil and gas ,under abnormal high pressure ,are injected into the Fuyang reservoir .E1 f 1 is mainly delta front facies and sand leisure development ,but the overall performance characteristics are show n as low porosi‐ty and low permeability . T he researchshow s that ,the deep reservoir development controlled by sedimentary microfacies ,depth and dia‐genesis ,abnormal pressure and hydrocarbon charging :Subaqueous distributary channel and mouth bar is sedimen‐tary microfacies favorable for effective reservoirs;Aproximately 3 000 m buried depth of reservoir section is in the late diagenetic stage A1 ,Secondary dissolution leads to the development of secondary pores and improves the reser‐voir conditions;T he existence of abnormal high pressure in deep layer is favorable for oil and gas filling ,the physi‐cal property of reservoir is protected under the favorable oil and gas injection conditions .Above all ,the favorable sedimentary microfacies and the development of secondary pore zone are the main factors to determine the deep de‐velopment of effective reservoir .
