咸化断陷湖盆典型页岩剖面地质特征——以东营凹陷为例

doi:10.13809/j.cnki.cn32-1825/te.2022.01.016

摘要/Abstract

摘要：

基于丰富的岩心、测井、地震资料,综合运用层序地层学、矿物学、沉积学等研究方法,宏观与微观分析相结合,对东营凹陷沙四上—沙三下亚段页岩剖面进行了系统解剖。研究表明：①咸化湖盆页岩矿物组成以富含碳酸盐为特征,主要发育富灰质页岩相和灰质页岩相为主的剖面相组合;②断陷湖盆深水页岩层序具有淹没不整合型层序特点,东营凹陷沙四上—沙三下亚段页岩剖面可以划分出2个三级层序、4个四级层序（体系域）、8个五级层序（准层序组）;③页岩岩相发育分布与层序具有明显的耦合关系,湖晚期湖扩体系域和早期高位体系域是富灰质页岩相有利发育段。研究认识对咸化断陷湖盆页岩层序划分及岩相分布预测具有一定的指导意义。

关键词: 页岩剖面, 碳酸盐, 岩相, 层序, 东营凹陷

Abstract:

Based on the abundant core, logging curves, seismic data, sequence stratigraphy, mineralogy, sedimentology and other research methods, the systematic dissection of shales in the upper and lower member of The Fourth and third member of the Shahejie formation in Dongying Sag was carried out by combining macro and micro analysis. The research results show that: ① The mineral composition of shale in saline lacustrine basin is characterized by rich carbonate, and there are mainly high content carbonate shale facies and calcareous shale facies. ② The deep-water shale sequence of the lacustrine rift basin is characterized by inundation unintegrated sequence. The shale section of the Upper Es₄ - Lower Es₃ sub-member in Dongying Sag can be divided into two third-order sequences, four fourth-order sequences （system tracts） and eight fifth-order sequences （parasequence groups）. ③ There is an obvious coupling relationship between shale lithofacies and sequence. The late lacustrine extensional system tract and early high system tract are the favorable stages of high content carbonate shale facies. The research and understanding have certain guiding significance for the division of shale sequence and the prediction of lithofacies distribution in saline lacustrine rift basins.

Key words: shale profile, carbonate, lithofacies, sequence stratigraphy, Dongying Sag

中图分类号:

TE132

王永诗,唐东. 咸化断陷湖盆典型页岩剖面地质特征——以东营凹陷为例[J]. 油气藏评价与开发, 2022, 12(1): 181-191.

WANG Yongshi,TANG Dong. Geological characteristics of typical shale profile in a saline lacustrine rift basin: A case study of Dongying sag[J]. Reservoir Evaluation and Development, 2022, 12(1): 181-191.

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井号	层位	取心长度(m)
Fy1	沙三中、沙三下、沙四上亚段	403.63
Ny1	沙三下、沙四上亚段	185.22
Ly1	沙三下、沙四上亚段	200.05
Fyp1	沙四上亚段	23.90

准层序组	数量 (个)	黏土矿物（%）	石英（%）	斜长石（%）	方解石（%）	白云石（%）	菱铁矿（%）	碳酸盐（%）	硬石膏（%）	黄铁矿（%）
P2ss4	214	31	21	3	34	6	2	42	1	3
P2ss3	308	24	25	3	36	8	1	45	1	3
P2ss2	159	21	24	4	41	8	0	49	0	4
P2ss1	96	15	24	3	49	7	0	56	0	2
P1ss4	166	13	26	3	49	7	0	56	0	2
P1ss3	156	19	29	3	37	8	1	46	0	3
P1ss2	256	18	24	3	36	14	2	52	0	3
P1ss1	162	14	18	6	34	25	0	57	0	3