西湖凹陷中央反转构造带花港组致密砂岩储层埋藏史-热史

发布时间：2018-05-30 11:24

本文选题：西湖凹陷 + 花港组　；参考：《成都理工大学学报(自然科学版)》2016年04期

【摘要】：探讨东海西湖凹陷中央反转构造带致密砂岩储层中相对优质储层的发育机理,为致密砂岩气的勘探开发提供依据。以实钻井裂变径迹年龄(AFT)实验数据为依据,锆石裂变径迹(ZFT)实验数据作为约束,利用Easy%Ro化学动力学模型,建立古近系花港组埋藏史-热史。结果表明:中央反转构造带的埋藏史-热史演化具有南北分带的特点。埋藏史北部和中部较为相近,中北部花港组自距今约34 Ma开始沉积,经历距今约14~10 Ma的抬升,玉泉组剥蚀厚度约为1.2km;南部花港组从距今33.9Ma开始沉积,经历了5Ma(距今15~10Ma)抬升,上覆的玉泉组被剥蚀近0.7km。花港组地层温度由北向南呈逐渐降低的趋势,由北向南3个区带的烃源岩地层有机质开始成熟的时间分别为距今20Ma、18Ma和15Ma。中央反转构造带北部曾经历更大的埋深和更高的地温梯度,相同埋深条件下北部储层比南部差。
[Abstract]:The development mechanism of relatively high quality reservoirs in tight sandstone reservoirs in the central reverse structural zone of Xihu depression in the East China Sea is discussed in order to provide the basis for exploration and development of tight sandstone gas. Based on the experimental data of fission track age and ZFT (zircon fission track), the burial history and thermal history of Huagang formation in Paleogene were established by using Easy%Ro chemical kinetic model. The results show that the evolution of burial history and thermal history of the central inversion tectonic belt has the characteristics of north and south zonation. The northern and central burial history of Huagang formation began to deposit about 34 Ma ago, experienced about 1410 Ma uplift, and the erosion thickness of Yuquan formation was about 1.2 km, Huagang formation in the south of China began to deposit from today's 33.9Ma and experienced 5 Ma. (15 ~ 10 Ma) uplift. The overlying Yuquan formation was denuded nearly 0.7 km. The formation temperature of Huagang formation decreases gradually from north to south, and the maturation time of organic matter in source rock formation from north to south is 20 Ma 18Ma and 15 Ma, respectively. The northern part of the central reverse tectonic belt has experienced greater burial depth and higher geothermal gradient, and the reservoir in the north is worse than that in the south under the same buried depth.
【作者单位】：中海石油(中国)有限公司上海分公司;
【基金】：“十三五”国家科技重大专项(2016ZX05027-002)
【分类号】：P618.13

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