珠江口盆地东部地区不同地温梯度下储层特征响应关系

发布时间：2018-03-19 18:19

本文选题：珠江口盆地东部地区　切入点：地温梯度　出处：《中国海上油气》2017年01期 　论文类型：期刊论文

【摘要】：珠江口盆地东部地区从北往南,地温梯度整体升高,不同地温梯度范围的储层物性随埋深变化趋势不同,低孔低渗深度下限差异明显。在大量铸体薄片和岩心分析的基础上,结合扫描电镜、X-衍射、压汞测试等资料,开展该地区不同地温梯度下的储层特征响应研究,结果表明:1高地温梯度下压实强度高、速率快、压实减孔效应明显。2高地温梯度下成岩演化快,成岩作用复杂,铁白云石等晚期胶结物类型多,浅埋藏条件下长石等易溶颗粒已不完全溶解并伴随高岭石的沉淀,高岭石伊利石化深度浅。3高地温梯度导致的成岩演化的加速最终使砂岩储层的孔隙结构多为小孔细喉型。4不同地温梯度地区低孔低渗的埋深界线不同,低地温梯度区为4 600 m,中低地温梯度区为3 500~4 000 m,中高和高地温梯度区分别为3 200和2 600 m。5低地温梯度区中深部储层甜点寻找方向为原始沉积条件优、成分和结构成熟度高的中粗粒以上粒级砂岩,抗压实能力强,可保存较多的原生孔;而超压保护、有效次生孔隙发育和早期烃类充注可成为高温盆地中深层储层甜点的有利条件。
[Abstract]:In the eastern area of Pearl River mouth basin, the geothermal gradient increases from north to south, and the reservoir physical properties of different geothermal gradient ranges vary with the buried depth, and the lower limit of low porosity and low permeability depth is obviously different. Based on the analysis of a large number of casting thin sections and cores, Combined with the data of scanning electron microscope (SEM), X-ray diffraction (SEM) and mercury injection test, the response of reservoir characteristics under different geothermal gradients in this area is studied. The results show that the compaction intensity is high and the rate is fast under the high geothermal gradient of 1: 1. The compaction reducing pore effect is obvious. 2. Under high geothermal gradient, diagenesis evolves rapidly, diagenesis is complex, late cementation types such as dolomite are many, and feldspar and other soluble particles are not completely dissolved and accompanied by kaolinite precipitation under shallow burial conditions. The acceleration of diagenetic evolution caused by shallow 3. 3 depth of kaolinite Illite and high temperature gradient makes the pore structure of sandstone reservoir mostly be small pore, fine throat type, 4 different geothermal gradient area, different buried depth boundary of low porosity and low permeability. The low geothermal gradient area is 4 600 m, the low and middle geothermal gradient area is 3 500 ~ 4 000 m, and the medium and high geothermal gradient regions are 3 200 and 2 600 m.5 respectively. The original sedimentary conditions are the best for the desserts of the middle and deep reservoirs in the low geothermal gradient region and the middle and high geothermal gradient area respectively. The medium coarse grained sandstone with high compositional and structural maturity has strong compaction resistance and can preserve more primary pores. The development of effective secondary pores and early hydrocarbon filling can be favorable conditions for medium and deep reservoirs in high temperature basins.
【作者单位】：中海石油(中国)有限公司深圳分公司;中海石油深海开发有限公司;
【基金】：“十三五”国家科技重大专项“珠江口盆地陆缘深水区沉积成岩过程与优质储层形成机制研究(编号:2016ZX05026-003-003)”部分研究成果
【分类号】：P618.13

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