Manghan fault depression is situated in southwestern uplifted area of Songliao basin,being reconstruction basin.Without sufficient understanding of its tectonic evolution,the analysis about its petroleum geological condition can not meet the requirements of petroleum exploration.With balanced section method,study of tectonic evolution of Manghan fault depression has been conducted, and the tectonic character in different period has been understood.In addition,the tectonic framework has been made clear in the study area,and the influence of the tectonic evolution on hydrocarbon source rock,reservoir,trapping and the major control factors for HC accumulation have been pointed out.

Yaoyingtai Oilfield is a big scale hydrocarbon region in the south of Songliao Basin discovered in recent years.According to analysis of hydrocarbon accumulation conditions in Qingshankou formation in Yaoyingtai region,major control factors of the formation of oil reservoirs includes source rocks,reservoir and migration.The oil reservoirs are mainly located around Qian’an sag which is the hydrocarbon generating center,and the accumulation and distribution of oil reservoirs is controlled by source rocks.Faults are not only the pathways for hydrocarbon migration,but also control the distribution of different types of oil reservoirs,and the distribution of sand body and reservoir physical properties are controlled by sediment microfacies.The main target for exploration of next step is the region near the hydrocarbon generating centers,faulted zone and sand body development zone.

Kolzhan area is located in Biykzhol relief,southeast of Astrakhan-Aktyubinsk uplift in Pre-Caspian Basin,and Kungurian salt of Lower Permian is developed widely here.The whole profile is divided into 2 hydrocarbon-bearing series by salt sediments,one is dominated by clastic rocks and another is dominated by carbonate rocks.Carboniferous formation is one of the main hydrocarbon-bearing formations beneath the salt sediments.According to the analysis of cuttings well K as well as the logging data,Carboniferous sedimentary characteristics are analyzed and sedimentary facies are classified and described.Three types of sedimentary facies are developed in Carboniferous formation of well K,including deep-water turbidite fan,slope and platform facies.Deep-water turbidite fan is further divided into inner,middle and outer fan,and platform facies is divided into interbank sag and platform shoal.Using drilling results of well K and regional data,early and late Carboniferous sedimentary facies distribution is predicted initially in Kolzhan area.

花沟-高青气田是济阳坳陷唯一的纯气田, 存在着多种类型的天然气藏, 以CO2气藏为主.气藏围绕青城凸起分布, 天然气组成呈东西分区特点(烃类气藏分布于东部-北部, 西部以CO2气藏为主), 这与凸起东邻博兴生烃洼陷以及西部火山活动强烈有关.西部气藏中CO2含量高达70%以上, δ13CCO2值范围为-3.4‰～-4.5‰, He气含量大于1%, 3 He/*$4 He比值为3.55×10-6～4.49×10-6, 为岩浆-幔源成因; 花501井馆陶组气藏CO2含量大于30%, 而N2含量大于50%, 系幔源成因为主的CO2-N2气藏.有利于形成CO2气藏的大地构造环境是地幔隆起和超壳断裂-岩浆活动带.花沟-高青气田CO2气藏正处于上新世-中新世玄武岩分布区内, 每一期岩浆的侵入和喷出就是一次成气期和可能的成藏期.上新世是本区最主要的非烃类气体的成藏期.在岩浆活动以前形成并与气源断裂直接连通的构造为CO2气聚集的有利圈闭.与此相比, 莺歌海盆地CO2气不大可能是含钙砂泥岩的热解产物,其形成很可能与中新世岩浆热液活动有关.

Helium content in natural gas reservoirs is very low, usually smaller than 0.1%. Gas helium not only has inmportant industrial values, but also is a major differential mark for the origin of natural gas especially nonhydrocarbons natural gas. In Hua-501 gas reservoir discovered in the Upper Tertiary Minghuazhen Formation (Nm) of Huagou area, the Jiyang Depression, the gas He content is up to 3.08%. The gas components of the gas reservoir is complex. It has not only nonhydrocarbons gas layers dominated by N 2 and CO 2, but also gas layers dominated by CH 4. It is a special gas reservoir of multiple and composite origins. δ 13 C CO 2 is equal to -8.3‰ , and 3He/ 4He is 4.47×10 -6 . These representative indexes reveal that N 2, CO 2, He and other nonhydrocarbons gases are mainly of mantle-source origins. δ 13 C 1 is equal to -48.8‰. This shows that gas CH 4 is organic genetic oil-type gas generated in the Lower Tertiary. The gas reservoir is located in the joint of the Jiyang Depression and the Luxi Uplift. It is controlled by the Gaoqing Fault which is a deep and large rift long activated since the Mesozoic, and is closely related to muti-stage magmatic activities. CH 4 gas layers and N 2, CO 2, He and other nonhydrocarbons gas layers are the products of two stages of accumulation. CH 4 accumulated early, and the accumulation of helium-enriched nonhydrocarbons gases happened within 3Ma from now.

油溶释放气是济阳蚴陷中浅层天然气的重要来源.本文从不同角度阐明了溶解相态是济阳蚴陷天然气初次运移的主要相态,并从油和地下水溶解天然气模型出发,首次定量地确定了济阳蚴陷油溶释放气的起始脱气深度,分析了天然气的赋存状态,建立了济阳蚴陷油溶释放气的脱气模式:不同洼陷起始脱气深度略有差异,一般在1700-2000m之间,平均1900m,埋藏深度小于起始脱气深度,是气藏气存在的主要区域.在起始脱气深度至1200m之间,以气顶气和夹层气藏为主;深度小于1200m,以纯气层气藏为主;在3900m至起始脱气深度之间,天然气在油中处于欠饱和状态,以溶解气的赋存形式为主;深度大于3900m,烃源岩开始进入游离气生成阶段,可形成深层原生气藏.另外,本文尝试性地提出了"饱和程度"的概念和计算方法,并预测了济阳坳陷天然气的有利含气区带.

花沟气田是胜利探区惟一的纯气田,天然气资源丰富,其分布复杂而又独具特点.与其他油气田相比,该气田存在多种成因类型的天然气藏,如甲烷气藏、二氧化碳气藏,以及甲烷、二氧化碳和氮的混源气藏.花501井氮气含量中混有高含量的氮气,其含量达到3.08%,国内少见,花4井还钻遇凝析气.文章结合近几年的研究成果,从气源、气藏类型、储集层特征等方面分析了多种类型气藏的成藏规律,有利于指导该区天然气勘探.