CAJ | 학술논문

采用地质与地球化学相结合的研究方法，通过致密油分布、物理性质、油源地球化学特征、储层特征及非均质性、圈闭条件及油水分布特征综合分析长7致密油成藏条件、主控因素与成藏特征。结果表明：长7致密油藏具备形成准连续型油气聚集的成藏地质条件和特征；长7油层组中发育优质烃源岩，主要以长73中的张家滩页岩为最优，烃源岩分布范围控制了致密油成藏外边界，烃源岩厚度大于20 m地区为最有利成藏区；长7致密油成藏具有良好的生、储、盖组合配置，重力流砂体主要呈透镜状或条带状分布于泥岩或油源岩中，具有优先捕集油气的优势；长7致密油成藏对圈闭要求相对较低，其遮挡条件主要为岩性、物性及成岩边界，动力圈闭也是重要的圈闭类型。长7致密油富集与局部构造背景没有直接的关系，而主要取决于储集层展布及物性；高强度生、排烃及强充注造成长7储层原始含油饱和度较高；受原始物质组成及成岩强度的影响，长7储层非均质性很强，致使油、气、水在致密储层中分异差，油、水分布复杂。
채용지질여지구화학상결합적연구방법，통과치밀유분포、물이성질、유원지구화학특정、저층특정급비균질성、권폐조건급유수분포특정종합분석장7치밀유성장조건、주공인소여성장특정。결과표명：장7치밀유장구비형성준련속형유기취집적성장지질조건화특정；장7유층조중발육우질경원암，주요이장73중적장가탄혈암위최우，경원암분포범위공제료치밀유성장외변계，경원암후도대우20 m지구위최유리성장구；장7치밀유성장구유량호적생、저、개조합배치，중력류사체주요정투경상혹조대상분포우니암혹유원암중，구유우선포집유기적우세；장7치밀유성장대권폐요구상대교저，기차당조건주요위암성、물성급성암변계，동력권폐야시중요적권폐류형。장7치밀유부집여국부구조배경몰유직접적관계，이주요취결우저집층전포급물성；고강도생、배경급강충주조성장7저층원시함유포화도교고；수원시물질조성급성암강도적영향，장7저층비균질성흔강，치사유、기、수재치밀저층중분이차，유、수분포복잡。
Through integration of geological and geochemical data ,this paper comprehensively analyzed the conditions , main controlling factors and characteristics of oil accumulation in the Chang 7 tight oil reservoir from such aspects as the tight oil distribution ,physical properties ,geochemical features of the oil source ,reservoir characteristics and heterogenei-ty ,trap conditions ,and oil and water distribution .The following results were obtained .The Chang 7 tight oil reservoirs own the geological conditions and characteristics for the formation of quasi-continuous oil and gas accumulation .The Chang 7 reservoir interval contains high-quality source rocks,of which the Zhangjiatan shale in the Chang 73 layer is the best one. The outer boundary of the tight oil reservoirs is controlled by the distribution of the source rocks .The favorable area of hy-drocarbon accumulation occur in where the thickness of hydrocarbon source rocks is over 20 m.The Chang 7 tight oil ac-cumulation has favorable source-reservoir-seal assemblages and the gravity flow sandbodies occur in the mudstone or source rocks mainly in lenticular or stripped shapes , thus are advantageous in trapping oil and gas .The importance of trapping conditions is relatively low for the accumulation of oil in the Chang 7 tight reservoir ,as the main seals are lithol-ogical,physical property and diagenesis boundaries .Dynamic trap is also an important trap type .Oil enrichment in the Chang 7 tight reservoir has no direct relationship with the local tectonic background ,instead is mainly controlled by reser-voir distribution and their physical properties .The high intensity of hydrocarbon generation ,expulsion and charging results in the relatively high original oil saturation in the Chang 7 reservoir .Due to the influences of the origin material composi-tion and diagenetic intensity ,the Chang 7 reservoir is of strong heterogeneity ,resulting in the poor differentiation of oil , gas and water ,and a complicated oil-water contact in the tight reservoir .