渤海海域渤中C地区中深层异常高压成因及对储层质量的影响

发布时间：2018-05-26 00:18

本文选题：中深层油气藏 + 异常高压　；参考：《西安石油大学学报(自然科学版)》2017年01期

【摘要】：以测压、薄片、扫描电镜、常规物性分析等资料为依据,开展渤海海域渤中C地区异常高压特征和成因、低渗储层特征及异常高压对成岩作用影响的研究。结果表明:沙河街组地层发育异常高压系统(压力系数1.25~1.56),上覆及内部烃源岩生烃及沙河街组岩层中黏土矿物成岩作用是沙河街组地层超压的主要成因机制。沙河街组储层整体具有中低孔、低渗特低渗的特征,地层异常高压对储层质量的影响具体表现在:1抑制压实作用的进行,有利于储层原生孔隙的保存;2有助于酸性流体进入,对储层发生溶蚀改造;3有助于储层微裂缝的形成,为酸性流体提供通道并加强长石的溶蚀作用;4使得碳酸盐胶结物及伊利石大量发育,不利于有机酸对储层的大规模溶蚀改造。因此,沙河街组储层相对高孔渗带主要发育在原始沉积条件下粒度相对较粗、分选较好的砂岩中。
[Abstract]:Based on the data of pressure measurement, thin slice, scanning electron microscope and conventional physical property analysis, the characteristics and genesis of abnormal high pressure, the characteristics of low permeability reservoir and the influence of abnormal high pressure on diagenesis in Bohai Sea area were studied. The results show that abnormal high pressure system (pressure coefficient 1.251.56) developed in Shahejie formation, overlying and internal hydrocarbon generation and clay mineral diagenesis in Shahejie formation are the main mechanism of formation overpressure in Shahejie formation. The reservoir of Shahejie formation is characterized by low porosity, low permeability and ultra-low permeability. The influence of abnormal high pressure on reservoir quality is manifested in the following aspects: 1. The inhibition of compaction is beneficial to the preservation of primary pores in the reservoir, which is conducive to the entry of acidic fluids. The formation of micro-fractures in reservoirs is helpful to the formation of micro-fractures in reservoir and the formation of carbonate cementation and Illite is enhanced by strengthening the dissolution of feldspar. This is not conducive to the large-scale dissolution and reconstruction of reservoirs by organic acids. Therefore, the relatively high porosity and permeability zone of the reservoir in Shahejie formation is mainly developed in sandstone with relatively coarse grain size and good sorting under the original sedimentary conditions.
【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家重大专项课题“近海隐蔽油气藏勘探技术”(编号:2011ZX05023-002) 中国海洋石油总公司科技攻关项目“渤海典型低孔低渗油藏勘探开发关键技术研究与实践”(编号:CNOOC-KJ125ZDXM07LTDTJ02)
【分类号】：P618.13

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