摘要:目前准噶尔盆地腹部地区超压演化过程仅提供了相对时间、概念、定性的认识，并未达到定量化。本文以东道海子北凹陷为例，基于流体包裹体、单井一维和剖面二维烃源岩成熟生烃史模拟技术，采用生烃增压模型定量化评价了侏罗纪八道湾组顶部和底部烃源岩的生烃增压演化过程。研究结果表明侏罗纪八道湾组为东道海子北凹陷主力烃源岩，具有幕式排烃的特点。八道湾组底部烃源岩经历了3 次超压增加和两次超压释放的过程，顶部烃源岩经历了两次超压增加和一次超压释放的过程。八道湾底部烃源岩3 次超压增加的时间分别为距今170～70 Ma、55～23 Ma、10～0 Ma，对应最大压力系数均为2.0，最大剩余流体压力50 MPa，两次超压释放的时间分别为70～55 Ma、23～10 Ma；八道湾组顶部烃源岩两次超压增加的时间分别为130～40 Ma、23～0 Ma，对应流体最大压力系数最大亦可达2.0 左右，最大剩余流体压力44 MPa，超压释放的时间为40～23 Ma。
关键词: 东道海子北凹陷/
盆地模拟/
流体包裹体/
生烃增压/
超压演化
Abstract:The process evolution of overpressure of Junggar Basin Dongdao Haizibei depression only provided the relative time, concept, and qualitative understanding, which has not achieved the quantitative result. In this paper, the author takes the Dongdao Haizibei depression as an example. Based on single well and two dimensional simulation technology of maturity hydrocarbon generation history, adopting hydrocarbon generating pressurization model to analyze the overpressure caused by J1b hydrocarbon generating pressurization. The results show that the Dongdao Haizibei depression J1b is the main hydrocarbon source rocks, and it also has the characteristic of episodic expulsion. The bottom of J1b hydrocarbon source rock experienced three overpressure increasing and two overpressure releasing processes. The three overpressure increasing times are 170～70 Ma、55～23 Ma、10～0 Ma, the corresponding maximum pressure coefficient is 2, and the maximum residual fluid pressure is 50 MPa. The release time of the two overpressure is 70～55 Ma、23～10 Ma; the two overpressure times are 130～40 Ma and 23～0 Ma respectively. The top of J1b hydrocarbon source rock only developed one hydrocarbon expulsion process, the two overpressure increasing time are 130～40 Ma, 23～0 Ma, and the corresponding maximum pressure coefficient can also reach 2, the maximum residual fluid pressure is 44 MPa, and the overpressure releasing time is 40～23 Ma.
Key words:Dongdao Haizibei depression/
Basin modeling/
Fluid inclusions/
Hydrocarbon generation pressurization/
Overpressure evolution
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