CAJ | 학술논문

　　成都凹陷上侏罗统蓬莱镇组气藏为次生气藏，其中的天然气来自纵向上距其3000多米的下伏上三叠统，储层和烃源岩层的远距离纵向分隔使得运移条件在成藏诸要素中尤为关键。蓬莱镇组中含气砂体较为发育且分布非均质性较强，认识其非均质性特征需要深入分析天然气富集的主控地质因素。通过气源分析，纵向上各气藏产出天然气的同位素组成、原始组分、干燥系数、iC4/nC4等地球化学特征分析表明，蓬莱镇组气藏天然气运移通道主要为气源断层和储集砂体，运移方式为借助断裂系统和纵向上较为发育的多套渗透性砂体进行立体式高效运移。勘探开发成果分析表明：发育气源断层是成都凹陷蓬莱镇组成藏的必要条件；气源断层与储层的合理配置、砂岩的储集性好坏进一步影响天然气富集程度，储层下倾方向与气源断层相接或与之邻近、砂岩物性好的地区天然气富集程度高。天然气在气源断层与储层合理配置带内的有利储层中最为富集的部署思想，大大提高了钻获高产井和工业气井的成功率。
　　성도요함상주라통봉래진조기장위차생기장，기중적천연기래자종향상거기3000다미적하복상삼첩통，저층화경원암층적원거리종향분격사득운이조건재성장제요소중우위관건。봉래진조중함기사체교위발육차분포비균질성교강，인식기비균질성특정수요심입분석천연기부집적주공지질인소。통과기원분석，종향상각기장산출천연기적동위소조성、원시조분、간조계수、iC4/nC4등지구화학특정분석표명，봉래진조기장천연기운이통도주요위기원단층화저집사체，운이방식위차조단렬계통화종향상교위발육적다투삼투성사체진행입체식고효운이。감탐개발성과분석표명：발육기원단층시성도요함봉래진조성장적필요조건；기원단층여저층적합리배치、사암적저집성호배진일보영향천연기부집정도，저층하경방향여기원단층상접혹여지린근、사암물성호적지구천연기부집정도고。천연기재기원단층여저층합리배치대내적유리저층중최위부집적부서사상，대대제고료찬획고산정화공업기정적성공솔。
The Upper Jurassic Penglaizhen Formation gas pool in Chengdu sag is a secondary gas pool with its gas being sourced from the Upper Triassic source rocks over 3 km beneath the reservoirs .Due to the long vertical distance between the reservoir and source rocks , the gas migration path and mechanism are assumed to be of particular importance .The gas-bearing sandstones are widely distributed in the Penglaizhen Formation and have great heterogeneity ,thus study of the principal controlling factors on gas accumulation is critical to understanding its heterogeneity .Analyses of gas sources , original gas compositions,isotopic compositions,dry coefficient,and iC4/nC4 demonstrate that the major hydrocarbon mi-gration pathways are source-rock-connected faults and permeable carrier beds through which gas is capable of migrating with high efficiency .Hydrocarbon exploration and exploitation indicate that source-rock-rooted faults and good-quality reser-voirs .The existence of source rock-rooted faults is the indispensable condition for gas accumulation in the Penglaizhen Fm in Chengdu sag .The rational combination between the source rock-rooted faults and reservoirs and the poroperm charateris-tics of reservoirs further influence the enrichment of gas .Gas is highly enriched in the downdip areas where the sandstones have good poroperm characteristics and are connected with or near to the source rock -rooted faults .The study results are valuable for gas exploration and development and can increase success rate in drilling prolific and commercial wells .