渤海海域旅大16构造沙三段沉火山碎屑岩储层物性及形成机理

发布时间：2018-06-05 16:59

本文选题：旅大构造 + 沉火山碎屑岩　；参考：《大庆石油地质与开发》2017年06期

【摘要】：渤海海域旅大16构造沙三段沉火山碎屑岩储层受火山碎屑物质和沉积作用双重控制,但优质储层形成机理尚不清楚。综合应用井壁取心、铸体薄片、测井曲线等资料,对沉火山碎屑岩储层致密成因及相对高渗储层主控因素进行了研究。结果表明:临近物源区的储层岩石成分成熟度和结构成熟度较低,成岩过程中形成大量搭桥状伊利石充填了孔隙,富铁、镁的安山岩岩屑蚀变析出细小黄铁矿晶簇,呈星散状密集分布在粒间,储层中毛管束缚水含量高是储层致密的主要成因;沉积期风化淋滤作用及后期成岩作用形成的高岭石对储层起到支撑和保护作用,酸性火山岩岩屑在埋藏过程中生成大量环颗粒分布的雏晶石英,能够起到抗压实和抑制伊利石生长的作用,酸性火山岩岩屑相对易溶蚀而形成次生孔隙,是局部相对高渗储层的主要成因。
[Abstract]:The sedimentary pyroclastic rock reservoir of the third member of structure Sha 3 of Lida 16 in Bohai Sea is controlled by pyroclastic material and sedimentation, but the formation mechanism of high quality reservoir is not clear. Based on the well wall coring, casting thin sheet and logging curves, the compactness origin of sedimentary pyroclastic reservoir and the main controlling factors of relatively high permeability reservoir are studied. The results show that the rock composition maturity and structure maturity are low in the adjacent source area, and a large number of bridging Illite fill the pores during the diagenesis process, and fine pyrite clusters are precipitated from the lithic alteration of the rocks rich in iron and magnesium. The formation of reservoir is mainly caused by high capillary irreducible water content, and the kaolinite formed by weathering and leaching and late diagenesis plays a supporting and protective role on the reservoir. In the process of burial, acid volcanic cuttings produce a large number of crystal crystals with ring particle distribution, which can resist compaction and inhibit the growth of Illite. The acid volcanic debris is relatively easy to dissolve and form secondary pores. It is the main cause of formation of local relatively high permeability reservoir.
【作者单位】：中海石油有限公司天津分公司;
【基金】：国家科技重大专项“近海隐蔽油气藏勘探技术”(2011ZX05023-002) 中海油重大科技项目“中国近海低孔低渗油气藏勘探开发关键技术与实践”(CNOOC-KJ 125 ZDXM 07 LTD-TJ-02)
【分类号】：P618.13

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