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

Abstract

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

CLC Number:

TE132

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.

Figures/Tables 10

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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

Geological characteristics of typical shale profile in a saline lacustrine rift basin: A case study of Dongying sag

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