CAJ | 학술논문

运用定量方法对西峰油田地层埋藏史、热史、生排烃史、成岩史、孔隙度演化史、油气充注期、圈闭形成史及成藏动力窗口演化史分别进行了模拟，并对成藏关键条件的时空匹配关系进行了综合分析。结果表明，从早白垩世开始，区域构造沉降及伴随的大规模盆地热事件引发了烃源岩的生排烃，为油气成藏创造了优越油源条件；成藏之前，有机酸的溶蚀作用极大地改善了长8段储层的物性，从而奠定了油气成藏所需的空间基础；随时空演化，源储压差的持续增大使油气充注进入储层成为了可能；从成藏期开始，成藏动力窗口和岩性圈闭窗口的持续发育，不但保障了油气的高效充注，而且使已形成的油藏能够很好地保存下来。成藏关键条件的时空匹配关系表明，西峰地区长8段储层油气成藏是一个自然的过程，成藏期储层物性良好，成藏后在压实和胶结作用下储层逐渐致密。
운용정량방법대서봉유전지층매장사、열사、생배경사、성암사、공극도연화사、유기충주기、권폐형성사급성장동력창구연화사분별진행료모의，병대성장관건조건적시공필배관계진행료종합분석。결과표명，종조백성세개시，구역구조침강급반수적대규모분지열사건인발료경원암적생배경，위유기성장창조료우월유원조건；성장지전，유궤산적용식작용겁대지개선료장8단저층적물성，종이전정료유기성장소수적공간기출；수시공연화，원저압차적지속증대사유기충주진입저층성위료가능；종성장기개시，성장동력창구화암성권폐창구적지속발육，불단보장료유기적고효충주，이차사이형성적유장능구흔호지보존하래。성장관건조건적시공필배관계표명，서봉지구장8단저층유기성장시일개자연적과정，성장기저층물성량호，성장후재압실화효결작용하저층축점치밀。
Using quantitative methods,the evolution process of formations,geothermal field,hydrocarbon gen-eration and drainage,diagenesis,porosity,accumulation times,traps and the driving force window are simula-ted,and the space-time matching of key accumulation factors are further analyzed.Results show that beginning form the Early Cretaceous,the regional structural subsidence and incidental significant geothermal event trig-gered the generation and drainage of source rocks.Dissolution of organic acid before accumulation period dra-matically improved the porosity of Chang 8 reservoir which provides enough space for oil accumulation.Follow-ing time-space evolution,the increasing pressure difference between source rocks and reservoirs makes the oil injected into reservoirs possible.Beginning at the accumulation period,the steady development of driving-force window and trap window not only promotes the efficiency of oil injection but also makes those already accumula-ted oil preserved safely.The time-space matching of key conditions of oil accumulation shows that oil accumula-tion in Xifeng oilfield is a natural process,namely,the porosity in Chang 8 reservoirs is perfect before the oil accumulation period,and after which,becomes denser and denser under compaction and cementation.