CAJ | 학술논문

揭示鄂尔多斯盆地延长组长1油层组油藏的油气富集规律对指导该盆地长1油层组的油气勘探具有重要意义。以陕北W地区为例，在地层划分对比的基础上，运用残余厚度法，并结合前人的区域古地貌研究成果，对研究区长1油层组顶部古地貌进行了恢复，同时分析了古地貌与长1油层组石油分布的关系。结合长1油层组的构造、沉积相、砂体厚度及封盖条件等控藏要素及与油气分布的关系，总结了研究区长1油层组油藏的富集规律。结果表明，研究区延长组长1油层组顶部发育有侵蚀沟谷、侵蚀斜坡和侵蚀残梁3种地貌单元，古地貌具有“一沟谷、两斜坡、两残梁”的特点，地形相对较高的残梁区对长1油层组石油分布具有重要控制作用。鼻状隆起构造脊、砂体较厚且砂地比较大的河道发育区也对长1油层组石油分布起着重要控制作用。另外，旋回性泥岩、致密砂岩层、侵蚀不整合面和水动力等多种封盖条件为长1油藏的形成起着重要遮挡作用。在上述控制因素作用下，形成以构造-岩性油藏和岩性油藏为主，岩性-水动力油藏为辅的多种油藏类型。鄂尔多斯盆地长1油层组的石油勘探重点应放在长1地形较高古地貌及沉积砂体发育的有利相带等的复合区域。
게시악이다사분지연장조장1유층조유장적유기부집규률대지도해분지장1유층조적유기감탐구유중요의의。이협북W지구위례，재지층화분대비적기출상，운용잔여후도법，병결합전인적구역고지모연구성과，대연구구장1유층조정부고지모진행료회복，동시분석료고지모여장1유층조석유분포적관계。결합장1유층조적구조、침적상、사체후도급봉개조건등공장요소급여유기분포적관계，총결료연구구장1유층조유장적부집규률。결과표명，연구구연장조장1유층조정부발육유침식구곡、침식사파화침식잔량3충지모단원，고지모구유“일구곡、량사파、량잔량”적특점，지형상대교고적잔량구대장1유층조석유분포구유중요공제작용。비상륭기구조척、사체교후차사지비교대적하도발육구야대장1유층조석유분포기착중요공제작용。령외，선회성니암、치밀사암층、침식불정합면화수동력등다충봉개조건위장1유장적형성기착중요차당작용。재상술공제인소작용하，형성이구조-암성유장화암성유장위주，암성-수동력유장위보적다충유장류형。악이다사분지장1유층조적석유감탐중점응방재장1지형교고고지모급침적사체발육적유리상대등적복합구역。
Revealing the accumulation patterns of Chang 1 oil reservoir of the Yangchang Formation in Ordos Basin is very significant for oil and gas exploration in this area .Based on stratigraphic division and correlation ,the paleogeomor-phology of Chang 1 oil reservoir is restored by using residual thickness methods combined with previous research of re-gional paleogeomorphology .On this basis ,its relationship with the distribution of hydrocarbons is analyzed .The patterns of hydrocarbon accumulation of this formation in this region are summarized through a comprehensive analysis of various controlling factors on hydrocarbon accumulation such as structures ,sedimentary facies ,sandstone thickness ,sealing condi-tions,and so on.Three geomorphic units are recognized in Chang 1 oil reservoir,namely erosion valley,erosion slope and erosion monadnock .The paleogeomorphology features in “one valley,two slopes and two monadnocks”.The erosion mo-nadnocks in relatively higher terrain ,the ridges of nose-like uplift ,channel sands with larger thickness and higher net-to-gross ratio all have significant controlling effects on distribution of hydrocarbons of this formation .Moreover ,cyclical mud-stone,tight sandstone ,erosion unconformity surfaces and hydrodynamic force all have large contributions to the sealing of the Chang 1 oil reservoir.Structural-lithologic reservoir and lithologic reservoir are the primary reservoir types ,while li-thologic-hydrodynamic reservoir is the secondary reservoir type .The overlapping regions of the main factors ,such as the higher paleogeomorphology and the favorable sedimentary facies zones with larger sandstone thickness are the key explo -ration targets of this formation in Ordos Basin .