莺歌海盆地流体压裂与热流体活动及天然气的幕式运移
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摘要
深入分析和探讨莺歌海盆地底辟高压流体压裂的成因演化３个阶段（超压流体囊形成、龟背拱张和压裂刺穿）及其特点，并对流体压裂刺穿过程中伴生的热流体活动特征进行追踪研究，提出以黏土矿物演化、镜质体反射率、储集层流体包裹体均一温度等地化指标的异常响应以及“模糊带”或“气烟囱”等地震信息作为热流体活动的识别标志。在此基础上，通过对底辟浅层气田天然气组成及碳同位素组成的非均质性、储集层包裹体的均一温度等的综合分析，发现至少存在３期来自深部中新统烃源岩的天然气充注，进而结合高压流体压裂的成因机理，初步建立了研究区底辟构造带的流体压裂一天然气幕式运移模式。
The mechanism for overpressured fluid fracturing, its effects on hydrocarbon migration and its evolution process that involves in three stages of the formation of overpressured fluid-pocket, the uplifting-extending of "turtle shell" pattern and the fracturing- diapiring in the diapir belt,the Yinggehai Basin are studied by the way of combing geological analyzing with numerical modeling. We investigate the tracers caused by heat-fluid flow that occurred during overpressured fluid fracturing, which are the abnormal responses of clay mineral evolution (X ray), vitrinite reflectance (R) and homogeneous temperatures of fluid inclusions and the geophysical characteristics of" gas chimney (gas wipe-out )" detected by seismic imagine. The data about heterogeneity of components and isotopic compositions of gas combined with fluid inclusions for the DF1-1 gas field located in the diapir belt can be used to trace and identify that the field were charged by at least three episodes of gases derived from deep Miocene source rocks. Therefore, We propose the model of episodic gas migration induced by overptessured fluid fracturing.
The mechanism for overpressured fluid fracturing, its effects on hydrocarbon migration and its evolution process that involves in three stages of the formation of overpressured fluid-pocket, the uplifting-extending of "turtle shell" pattern and the fracturing- diapiring in the diapir belt,the Yinggehai Basin are studied by the way of combing geological analyzing with numerical modeling. We investigate the tracers caused by heat-fluid flow that occurred during overpressured fluid fracturing, which are the abnormal responses of clay mineral evolution (X ray), vitrinite reflectance (R) and homogeneous temperatures of fluid inclusions and the geophysical characteristics of" gas chimney (gas wipe-out )" detected by seismic imagine. The data about heterogeneity of components and isotopic compositions of gas combined with fluid inclusions for the DF1-1 gas field located in the diapir belt can be used to trace and identify that the field were charged by at least three episodes of gases derived from deep Miocene source rocks. Therefore, We propose the model of episodic gas migration induced by overptessured fluid fracturing.
引文
1胡济世.异常高压、流体压裂与油气运移.石油勘探与开发,1989,16 (2,3).
2 Hunt J M.Ceneration and migration of petroleum from abnormally pressured fluid Compartments. AAPG Bulletin, 1990, 74(1)
3董伟良等.东方1-1气田天然气组成的不均一性与幕式充注.石油勘 探与开发,1999,26(2):15～18.
2 Hunt J M.Ceneration and migration of petroleum from abnormally pressured fluid Compartments. AAPG Bulletin, 1990, 74(1)
3董伟良等.东方1-1气田天然气组成的不均一性与幕式充注.石油勘 探与开发,1999,26(2):15～18.
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