'has been much explored' is a correct and usable phrase in written English.
You can use it to describe something that has been thoroughly or extensively studied or investigated, for example: The effects of climate change on marine life has been much explored in recent years.
Casual sex has been much explored in psychological literature, but most of the data captured by her research team — and most of the other experimental research she had encountered — had been taken from college students.
The area has been much explored on the web, in video games, product design, and in the digital art world.
The only area that has been much explored in relation to carbohydrate and the brain is that of sugars and cognition.
The last two elements have been explored in studies on residents' experiences with errors [ 1- 8], whereas the first element - the individual profile of the resident - has been much less explored.
Another possibility that has been much less explored is reproductive character displacement, also called reinforcement of reproductive barriers, a pattern of greater divergence of a trait between closely related taxa in areas of sympatry than in areas of recent contact following allopatric divergence [87].
The room temperature gaseous ammonia pretreatment has been much less explored.
Indeed, while this is a known phenomenon in plant cells [ 36], the light-dependent redistribution of mitochondria along actin or microtubule has been much less explored in mammalian cells.
The mechanism of programmed cell death (PCD) has been much more extensively explored at the physiological and molecular levels.
Recently there has been much interest in exploring the combination of different MRI imaging techniques (i.e. Tensor based morphometry, cortical thicknesses and volumes) with cerebrospinal fluid (CSF) biomarkers, 18F-fluorodeoxyglucose PET, and clinical examination for classifying AD and predicting MCI conversion to AD (Wolz et al. 2011; Vemuri et al. 2009; Zhang et al. 2011; Furney et al. 2011).
There has been much study and discussion exploring the potential role of complex biological and environmental factors and underlying pathways in the aetiology of the increased cardiovascular disease burden in South Asians.
The United States has been much less ready than South Korea to explore closer relations with North Korea.
