CAJ | 학술논문

鄂尔多斯盆地陕北地区中生界三叠系延长组发育大型三角洲体系,形成了两套有利的生储盖组合,并发育多套油层.勘探实践证明:油藏的形成和分布受延长组生油凹陷的控制,三角洲储集砂体是形成大型油田的物质基础,次生浊沸石溶解在低渗透背景上形成相对高渗区,储油砂体上倾岩性变化构成隐蔽性岩性圈闭遮挡条件,形成的三角洲油藏具有规模大、工业产层多、油气资源丰富的特点.通过对鄂尔多斯盆地陕北地区石油成藏地质条件进行分析,总结出岩性油藏的成藏特征及勘探方法,深化和丰富了岩性油藏勘探理论,推动了陕北地区三角洲油藏的勘探步伐.
악이다사분지협북지구중생계삼첩계연장조발육대형삼각주체계,형성료량투유리적생저개조합,병발육다투유층.감탐실천증명:유장적형성화분포수연장조생유요함적공제,삼각주저집사체시형성대형유전적물질기출,차생탁비석용해재저삼투배경상형성상대고삼구,저유사체상경암성변화구성은폐성암성권폐차당조건,형성적삼각주유장구유규모대、공업산층다、유기자원봉부적특점.통과대악이다사분지협북지구석유성장지질조건진행분석,총결출암성유장적성장특정급감탐방법,심화화봉부료암성유장감탐이론,추동료협북지구삼각주유장적감탐보벌.
There are large deltaic systems in the Triassic Yanchang Formation in the northern Shaanxi area of the Ordos Basin, and developed two sets of good source-reservoir-caprock assemblages and many sets of oil-bearing beds.Exploration experience demonstrates that the formation and distribution of the reservoir were controlled by the generative depression of the Yanchang Formation, and deltaic reservoir sand body is the material basis for large-scale oilfields. In addition, secondary laumontite in a low permeable area was dissolved and then a high permeable area was formed. The updip lithologic variety of reservoir sand bodies is favorable to the formation of subtle lithologic traps, and the deltaic reservoirs are characterized by large multi-beds of oil-generation and abundant hydrocarbon resources. In this paper, the petroleum geologic settings of the studied area are analyzed, and the accumulation characteristics and exploration methods of lithologic reservoirs are summarized. It is of theoretical significance for the study of the exploration theories of lithologic reservoirs, and also expedites the exploration steps of deltaic reservoirs in the northern Shaanxi area.