莺歌海盆地东方1-1气田成藏条件及其启示
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摘要
由于莺歌海盆地众多底辟构造具有相似的成因联系,为研究其底辟构造特殊的天然气成藏条件,通过储层成岩作用、地层水化学分析等,对东方1-1气田进行了剖析,揭示出该气田的成藏地质条件与底辟运动及深部热流体活动息息相关,即:底辟运动为产生背斜构造创造了条件,深部热流体促进了有机质热演化,与底辟运动相伴生的断层与垂向裂隙为深部气源向浅部运移提供了快速通道,多期且具继承性的底辟活动使得天然气成藏期晚,近断层处热流体活动较强烈,临滨亚相粉细砂岩是良好储层,同时具有明显的含气地震信息异常。该盆地内其他底辟构造与东方1-1气田具有类似的成藏地质条件,在东方1-1气田成功开发的启示下,促进了一批与底辟运动有关的天然气田的发现。
There is similarity in relevant genesis among those diapiric structures in the Yingehai Basin.Through the analysis of the diagenesis of reservoirs and the hydrochemical property of formation water,it is discovered that the gas pooling conditions in the Dongfang 1-1 Gas Field are closely related to the diapiric and thermal fluid activities.The diapiric activities provided good condition for the formation of anticline structures;while deep thermal fluids stimulated the thermal evolution of organic matters.The concomitant faults and vertical fissures along with the diapiric structure provided a green channel for the deep source gas to migrate to the shallow formations.Multi-periodic and successive diapiric activities resulted in the gas pooling at later periods and fierce activities of thermal fluids near the faults.Finally,the accumulated gas was well preserved in the fine siltstones of the shorefacies,from which the obvious seismic anomaly information was obtained.This study provides reference for more discoveries of gas reservoirs associated with diapiric structures in this basin.
There is similarity in relevant genesis among those diapiric structures in the Yingehai Basin.Through the analysis of the diagenesis of reservoirs and the hydrochemical property of formation water,it is discovered that the gas pooling conditions in the Dongfang 1-1 Gas Field are closely related to the diapiric and thermal fluid activities.The diapiric activities provided good condition for the formation of anticline structures;while deep thermal fluids stimulated the thermal evolution of organic matters.The concomitant faults and vertical fissures along with the diapiric structure provided a green channel for the deep source gas to migrate to the shallow formations.Multi-periodic and successive diapiric activities resulted in the gas pooling at later periods and fierce activities of thermal fluids near the faults.Finally,the accumulated gas was well preserved in the fine siltstones of the shorefacies,from which the obvious seismic anomaly information was obtained.This study provides reference for more discoveries of gas reservoirs associated with diapiric structures in this basin.
引文
[1]张启明,郝芳.莺—琼盆地演化与含油气系统[J].中国科学:D辑地球科学,1997,27(2):149-154.
[2]黄保家,肖贤明,董伟良.莺歌海盆地烃源岩特征及天然气生成演化[J].天然气工业,2002,22(1):26-30.
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[4]谢培勇.海上浅层大气田——DF1-1气田[J].天然气工业,1999,19(1):43-46.
[5]张敏强.莺歌海盆地泥底辟构造带浅层气田形成条件与勘探开发前景[J].天然气工业,1999,19(1):25-27.
[6]解习农,李思田,董伟良,等.热流体活动示踪标志及其地质意义——以莺歌海盆地为例[J].地球科学——中国地质大学学报,1999,24(2):183-188.
[7]何家雄,李明兴,陈伟煌.莺歌海盆地热流体上侵活动与天然气运聚成藏的关系[J].天然气地球科学,2000,11(6):29-43.
[8]李纯泉,杨计海.莺—琼盆地热流体活动示踪标志及其油气运聚指向意义[J].天然气工业,2003,23(4):19-22.
[9]黄保家,李绪深,谢瑞永.莺歌海盆地输导系统及天然气主运移方向[J].天然气工业,2007,27(4):4-6.
[10]王立锋,马光克,周家雄,等.东方气田储层非均质性描述[J].天然气工业,2009,29(1):38-40.
[2]黄保家,肖贤明,董伟良.莺歌海盆地烃源岩特征及天然气生成演化[J].天然气工业,2002,22(1):26-30.
[3]龚再升,李思田.南海北部大陆边缘盆地油气成藏动力学研究[M].北京:科学出版社,2004:25-29.
[4]谢培勇.海上浅层大气田——DF1-1气田[J].天然气工业,1999,19(1):43-46.
[5]张敏强.莺歌海盆地泥底辟构造带浅层气田形成条件与勘探开发前景[J].天然气工业,1999,19(1):25-27.
[6]解习农,李思田,董伟良,等.热流体活动示踪标志及其地质意义——以莺歌海盆地为例[J].地球科学——中国地质大学学报,1999,24(2):183-188.
[7]何家雄,李明兴,陈伟煌.莺歌海盆地热流体上侵活动与天然气运聚成藏的关系[J].天然气地球科学,2000,11(6):29-43.
[8]李纯泉,杨计海.莺—琼盆地热流体活动示踪标志及其油气运聚指向意义[J].天然气工业,2003,23(4):19-22.
[9]黄保家,李绪深,谢瑞永.莺歌海盆地输导系统及天然气主运移方向[J].天然气工业,2007,27(4):4-6.
[10]王立锋,马光克,周家雄,等.东方气田储层非均质性描述[J].天然气工业,2009,29(1):38-40.
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