CAJ | 학술논문

渤南洼陷古近系天然气呈现良好的勘探前景.研究天然气成藏条件,有助于认识天然气的成藏过程和成藏机理,为今后的天然气勘探提供理论依据.综合利用地质、地震、测井和录井等资料,系统分析了该区的有利成藏条件.研究表明,渤南洼陷气源灶以沙四上亚段为主,热演化程度高,晚期成藏,具有优越的气源条件;各类扇体及次生孔隙形成古近系天然气较好的储集条件;沙三中、下亚段泥岩及沙四上的膏盐层与泥岩互层,共同构成了优质区域盖层与天然气保存条件;各成藏地质条件的有效配置是天然气聚集成藏的关键因素;渤南洼陷深层发育的膏盐层,相应形成盐间及盐下两套天然气成藏系统.生气中心及周缘广泛分布的各类扇体为该区下一步的勘探目标.
발남와함고근계천연기정현량호적감탐전경.연구천연기성장조건,유조우인식천연기적성장과정화성장궤리,위금후적천연기감탐제공이론의거.종합이용지질、지진、측정화록정등자료,계통분석료해구적유리성장조건.연구표명,발남와함기원조이사사상아단위주,열연화정도고,만기성장,구유우월적기원조건;각류선체급차생공극형성고근계천연기교호적저집조건;사삼중、하아단니암급사사상적고염층여니암호층,공동구성료우질구역개층여천연기보존조건;각성장지질조건적유효배치시천연기취집성장적관건인소;발남와함심층발육적고염층,상응형성염간급염하량투천연기성장계통.생기중심급주연엄범분포적각류선체위해구하일보적감탐목표.
The prospect of natural gas exploration in Paleogene, Bonan sag is very promising. The study on the gas reservoir forming conditions will help to understand the forming process and the mechanism of the gas reservoirs, and to provide a theoretical basis for future gas exploration. It is carried out in this paper, based on geological, seismic and logging data in this area. It is shown that the main gas generating bed is the upper Sha4, with high thermal evolution degree, as a late accumulation, and with advantageous gas source conditions. All kinds of fans and secondary pores create favorable reservoir conditions of Eogene. Mudstone in middle and lower Sha3, together with salt bed and mudstone in upper Sha4, form a favorable regional cap bed and reservoir bed. The effective configuration of reservoir-forming and geologic conditions is the key factor of the natural gas accumulation. Deep Bonan sag correspondingly forms an inter and below salt bed natural gas reservoir-forming system. The gas generation center and the areas surrounding all kinds of fans are the next exploration targets.