A Study on Astronomical Cycle Identification and Environmental Response Characteristics of Lacustrine Deep-Water Fine-Grained Sedimentary Rocks: A Case Study of the Lower Submember of Member 3 of Shahejie Formation in Well Fanye-1 of Dongying Sag, Bohai Bay Basin, China

Table 2

30-50 Ma earth orbital parameter periods and their ratio relationship.

Parameter	Theoretical cycle (ka)	Ratio
Eccentricity	405.00	21.667	21.525	18.407	17.397	10.510	10.348	10.186	7.837	4.253	4.090	3.260
	124.22	6.646	6.602	5.646	5.336	3.224	3.174	3.124	2.404	1.304	1.255	1.000
	99.01	5.297	5.262	4.500	4.253	2.569	2.530	2.490	1.916	1.040	1.000
	95.24	5.095	5.062	4.329	4.091	2.471	2.433	2.395	1.843	1.000
Obliquity	51.68	2.765	2.747	2.349	2.220	1.341	1.320	1.300	1.000
	39.76	2.127	2.113	1.807	1.708	1.032	1.016	1.000
	39.14	2.094	2.080	1.779	1.681	1.016	1.000
	38.54	2.062	2.048	1.751	1.655	1.000
Precession	23.28	1.245	1.237	1.058	1.000
	22.00	1.177	1.169	1.000
	18.82	1.007	1.000
	18.69	1.000